Adds support for dyed stargate signs

A dyed sign's color will now take priority over its main sign color. Black is used as the "default" color, so use black dye to remove dye effects
Adds a new class to keep track of a sign and its colors
Updates a bunch of code to make everything account for the dye color

src/main/java/net/knarcraft/stargate/container/SignData.java

@@ -0,0 +1,64 @@
+package net.knarcraft.stargate.container;
+
+import net.md_5.bungee.api.ChatColor;
+import org.bukkit.Color;
+import org.bukkit.DyeColor;
+import org.bukkit.block.Sign;
+
+/**
+ * A class that keeps track of the sign colors for a given sign
+ */
+public class SignData {
+
+    private final Sign sign;
+    private final ChatColor mainSignColor;
+    private final ChatColor highlightSignColor;
+    private final DyeColor dyedColor;
+
+    /**
+     * Instantiates a new sign colors object
+     *
+     * @param sign               <p>The sign the colors belong to</p>
+     * @param mainSignColor      <p>The main color to use for the sign</p>
+     * @param highlightSignColor <p>The highlighting color to use for the sign</p>
+     */
+    public SignData(Sign sign, ChatColor mainSignColor, ChatColor highlightSignColor) {
+        this.sign = sign;
+        this.mainSignColor = mainSignColor;
+        this.highlightSignColor = highlightSignColor;
+        this.dyedColor = sign.getColor();
+    }
+
+    /**
+     * Gets the sign of this sign colors object
+     *
+     * @return <p>The sign of this sign colors object</p>
+     */
+    public Sign getSign() {
+        return sign;
+    }
+
+    /**
+     * Gets the main color of the sign
+     *
+     * @return <p>The main color of the sign</p>
+     */
+    public ChatColor getMainSignColor() {
+        if (dyedColor != DyeColor.BLACK) {
+            Color color = dyedColor.getColor();
+            return ChatColor.of(String.format("#%02X%02X%02X", color.getRed(), color.getGreen(), color.getBlue()));
+        } else {
+            return mainSignColor;
+        }
+    }
+
+    /**
+     * Gets the highlighting color of the sign
+     *
+     * @return <p>The highlighting color of the sign</p>
+     */
+    public ChatColor getHighlightSignColor() {
+        return highlightSignColor;
+    }
+
+}