Makes it possible to enable debug mode

Debug mode is now enabled if the property `debug = true` is set in `conf/config.properties`
Changes code for reading internal configurations
Changes many primitive lists to List<>
Adds some missing annotations
Renames the main class

src/main/java/net/knarcraft/ffmpegconverter/utility/FileHelper.java

@@ -0,0 +1,178 @@
+package net.knarcraft.ffmpegconverter.utility;
+
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+
+import java.io.BufferedReader;
+import java.io.BufferedWriter;
+import java.io.FileInputStream;
+import java.io.FileNotFoundException;
+import java.io.FileOutputStream;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.InputStreamReader;
+import java.io.OutputStreamWriter;
+import java.nio.charset.StandardCharsets;
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+
+/**
+ * A helper class for dealing with files
+ */
+@SuppressWarnings("unused")
+public final class FileHelper {
+
+    private FileHelper() {
+
+    }
+
+    /**
+     * Gets a buffered reader for an internal file
+     *
+     * @param file <p>The name of the file to get a buffered reader for (start with a '/'). The file should reside in
+     *             the resources directory.</p>
+     * @return <p>A buffered read for reading the file</p>
+     * @throws FileNotFoundException <p>If unable to get an input stream for the given file</p>
+     */
+    @NotNull
+    public static BufferedReader getBufferedReaderForInternalFile(@NotNull String file) throws FileNotFoundException {
+        InputStream inputStream = getInputStreamForInternalFile(file);
+        if (inputStream == null) {
+            throw new FileNotFoundException("Unable to read the given file");
+        }
+        return getBufferedReaderFromInputStream(inputStream);
+    }
+
+    /**
+     * Gets an input stream from a string pointing to an internal file
+     *
+     * <p>This is used for getting an input stream for reading a file contained within the compiled .jar file. The file
+     * should be in the resources directory, and the file path should start with a forward slash ("/") character.</p>
+     *
+     * @param file <p>The file to read</p>
+     * @return <p>An input stream for the file</p>
+     */
+    @Nullable
+    public static InputStream getInputStreamForInternalFile(@NotNull String file) {
+        return FileHelper.class.getResourceAsStream(file);
+    }
+
+    /**
+     * Gets a buffered reader from a string pointing to a file
+     *
+     * @param file <p>The file to read</p>
+     * @return <p>A buffered reader reading the file</p>
+     * @throws FileNotFoundException <p>If the given file does not exist</p>
+     */
+    @NotNull
+
+    public static BufferedReader getBufferedReaderFromString(@NotNull String file) throws FileNotFoundException {
+        FileInputStream fileInputStream = new FileInputStream(file);
+        return getBufferedReaderFromInputStream(fileInputStream);
+    }
+
+    /**
+     * Gets a buffered reader given an input stream
+     *
+     * @param inputStream <p>The input stream to read</p>
+     * @return <p>A buffered reader reading the input stream</p>
+     */
+    @NotNull
+    public static BufferedReader getBufferedReaderFromInputStream(@NotNull InputStream inputStream) {
+        InputStreamReader inputStreamReader = new InputStreamReader(inputStream, StandardCharsets.UTF_8);
+        return new BufferedReader(inputStreamReader);
+    }
+
+    /**
+     * Gets a buffered writer from a string pointing to a file
+     *
+     * @param file <p>The file to write to</p>
+     * @return <p>A buffered writer writing to the file</p>
+     * @throws FileNotFoundException <p>If the file does not exist</p>
+     */
+    @NotNull
+    public static BufferedWriter getBufferedWriterFromString(@NotNull String file) throws FileNotFoundException {
+        FileOutputStream fileOutputStream = new FileOutputStream(file);
+        OutputStreamWriter outputStreamWriter = new OutputStreamWriter(fileOutputStream, StandardCharsets.UTF_8);
+        return new BufferedWriter(outputStreamWriter);
+    }
+
+    /**
+     * Reads key/value pairs from a buffered reader
+     *
+     * @param bufferedReader <p>The buffered reader to read</p>
+     * @param separator      <p>The separator separating a key from a value</p>
+     * @return <p>A map containing the read pairs</p>
+     * @throws IOException <p>If unable to read from the stream</p>
+     */
+    @NotNull
+    public static Map<String, String> readKeyValuePairs(@NotNull BufferedReader bufferedReader,
+                                                        @NotNull String separator) throws IOException {
+        Map<String, String> readPairs = new HashMap<>();
+        List<String> lines = readLines(bufferedReader);
+
+        for (String line : lines) {
+            int separatorIndex = line.indexOf(separator);
+            if (separatorIndex == -1) {
+                continue;
+            }
+
+            //Read the line
+            String key = line.substring(0, separatorIndex);
+            String value = line.substring(separatorIndex + 1);
+            readPairs.put(key, value);
+        }
+
+        return readPairs;
+    }
+
+    /**
+     * Reads a list from a buffered reader
+     *
+     * @param bufferedReader <p>The buffered reader to read</p>
+     * @return <p>A list of the read strings</p>
+     * @throws IOException <p>If unable to read from the stream</p>
+     */
+    @NotNull
+    public static List<String> readLines(@NotNull BufferedReader bufferedReader) throws IOException {
+        List<String> readLines = new ArrayList<>();
+
+        String line = bufferedReader.readLine();
+        boolean firstLine = true;
+        while (line != null) {
+            //Strip UTF BOM from the first line
+            if (firstLine) {
+                line = removeUTF8BOM(line);
+                firstLine = false;
+            }
+            //Split at first separator
+            if (line.isEmpty()) {
+                line = bufferedReader.readLine();
+                continue;
+            }
+
+            readLines.add(line);
+            line = bufferedReader.readLine();
+        }
+        bufferedReader.close();
+
+        return readLines;
+    }
+
+    /**
+     * Removes the UTF-8 Byte Order Mark if present
+     *
+     * @param string <p>The string to remove the BOM from</p>
+     * @return <p>A string guaranteed without a BOM</p>
+     */
+    private static @NotNull String removeUTF8BOM(@NotNull String string) {
+        String UTF8_BOM = "\uFEFF";
+        if (string.startsWith(UTF8_BOM)) {
+            string = string.substring(1);
+        }
+        return string;
+    }
+
+}