Adds Dynmap integration

This adds Dynmap integration for displaying Stargates in Dynmap
API version is changed back to 1.18 as 1.19 is still kind of new
Version is now 0.9.4.1

src/main/java/net/knarcraft/stargate/config/ConfigOption.java

@@ -178,7 +178,18 @@ public enum ConfigOption {
     /**
      * The velocity of players exiting a stargate, relative to the entry velocity
      */
-    EXIT_VELOCITY("gates.exitVelocity", "The velocity of players exiting stargates, relative to the entry velocity", 0.1D);
+    EXIT_VELOCITY("gates.exitVelocity", "The velocity of players exiting stargates, relative to the entry velocity", 0.1D),
+
+    /**
+     * Whether to enable showing Stargates in Dynmap
+     */
+    ENABLE_DYNMAP("dynmap.enableDynmap", "Whether to display Stargates in Dynmap's map", true),
+
+    /**
+     * Whether to hide Dynmap icons by default
+     */
+    DYNMAP_ICONS_DEFAULT_HIDDEN("dynmap.dynmapIconsHiddenByDefault",
+            "Whether to hide Stargate's Dynmap icons by default, requiring the user to enable them.", true);
 
     private final String configNode;
     private final String description;