Migrate gradle scripts to have multiple modules and source sets. Using Kotlin-DSL for enhanced script debugging.

Signed-off-by: Gabriel Harris-Rouquette <gabizou@me.com>

bukkit/src/main/java/com/gmail/nossr50/config/ConfigLoader.java

@@ -0,0 +1,89 @@
+package com.gmail.nossr50.config;
+
+import com.gmail.nossr50.mcMMO;
+import org.bukkit.configuration.file.FileConfiguration;
+import org.bukkit.configuration.file.YamlConfiguration;
+
+import java.io.File;
+import java.util.List;
+
+public abstract class ConfigLoader {
+    protected static final mcMMO plugin = mcMMO.p;
+    protected String fileName;
+    private File configFile;
+    protected FileConfiguration config;
+
+    public ConfigLoader(String relativePath, String fileName) {
+        this.fileName = fileName;
+        configFile = new File(plugin.getDataFolder(), relativePath + File.separator + fileName);
+        loadFile();
+    }
+
+    public ConfigLoader(String fileName) {
+        this.fileName = fileName;
+        configFile = new File(plugin.getDataFolder(), fileName);
+        loadFile();
+    }
+
+    protected void loadFile() {
+        if (!configFile.exists()) {
+            plugin.debug("Creating mcMMO " + fileName + " File...");
+
+            try {
+                plugin.saveResource(fileName, false); // Normal files
+            }
+            catch (IllegalArgumentException ex) {
+                plugin.saveResource(configFile.getParentFile().getName() + File.separator + fileName, false); // Mod files
+            }
+        }
+        else {
+            plugin.debug("Loading mcMMO " + fileName + " File...");
+        }
+
+        config = YamlConfiguration.loadConfiguration(configFile);
+    }
+
+    protected abstract void loadKeys();
+
+    protected boolean validateKeys() {
+        return true;
+    }
+
+    protected boolean noErrorsInConfig(List<String> issues) {
+        for (String issue : issues) {
+            plugin.getLogger().warning(issue);
+        }
+
+        return issues.isEmpty();
+    }
+
+    protected void validate() {
+        if (validateKeys()) {
+            plugin.debug("No errors found in " + fileName + "!");
+        }
+        else {
+            plugin.getLogger().warning("Errors were found in " + fileName + "! mcMMO was disabled!");
+            plugin.getServer().getPluginManager().disablePlugin(plugin);
+            plugin.noErrorsInConfigFiles = false;
+        }
+    }
+
+    public File getFile() {
+        return configFile;
+    }
+
+    public void backup() {
+        plugin.getLogger().warning("You are using an old version of the " + fileName + " file.");
+        plugin.getLogger().warning("Your old file has been renamed to " + fileName + ".old and has been replaced by an updated version.");
+
+        configFile.renameTo(new File(configFile.getPath() + ".old"));
+
+        if (plugin.getResource(fileName) != null) {
+            plugin.saveResource(fileName, true);
+        }
+
+        plugin.getLogger().warning("Reloading " + fileName + " with new values...");
+        loadFile();
+        loadKeys();
+    }
+}