Performs some necessary work required for the edit command

Adds an implementation for the edit tab completer
Adds an enum representing a paid sign property
Adds an enum representing a paid sign condition property
Adds aliases to all commands

src/main/java/net/knarcraft/paidsigns/property/PaidSignConditionProperty.java

@@ -0,0 +1,63 @@
+package net.knarcraft.paidsigns.property;
+
+/**
+ * A representation of a paid sign condition's editable properties
+ */
+public enum PaidSignConditionProperty {
+
+    /**
+     * The string used to trigger the paid sign condition
+     */
+    STRING_TO_MATCH("stringToMatch"),
+
+    /**
+     * Whether to execute the match string as a regular expression
+     */
+    EXECUTE_REG_EX("executeRegEx"),
+
+    /**
+     * Whether to ignore case for the sign condition
+     */
+    IGNORE_CASE("ignoreCase"),
+
+    /**
+     * Whether to ignore color for the sign condition
+     */
+    IGNORE_COLOR("ignoreColor");
+
+    private final String stringRepresentation;
+
+    /**
+     * Instantiates a new paid sign condition property
+     *
+     * @param stringRepresentation <p>The string representation of the paid sign condition property</p>
+     */
+    PaidSignConditionProperty(String stringRepresentation) {
+        this.stringRepresentation = stringRepresentation;
+    }
+
+    /**
+     * Gets the string representation of this paid sign condition property
+     *
+     * @return <p>The string representation of this paid sign condition property</p>
+     */
+    public String getStringRepresentation() {
+        return this.stringRepresentation;
+    }
+
+    /**
+     * Gets the paid sign property matching the given string
+     *
+     * @param propertyString <p>The string representing a paid sign condition property</p>
+     * @return <p>The matching paid sign condition property, or null if no such property exists</p>
+     */
+    public static PaidSignConditionProperty getFromString(String propertyString) {
+        for (PaidSignConditionProperty paidSignProperty : PaidSignConditionProperty.values()) {
+            if (paidSignProperty.getStringRepresentation().equalsIgnoreCase(propertyString)) {
+                return paidSignProperty;
+            }
+        }
+        return null;
+    }
+
+}