Move wilderness plguin to combat package, remove explicit return and fix typo.

data/plugins/combat/plugin.xml

@@ -0,0 +1,17 @@
+<?xml version="1.0"?>
+<plugin>
+  <id>combat</id>
+  <version>1</version>
+  <name>Combat</name>
+  <description>Manages combat between game characters.</description>
+  <authors>
+    <author>Ryley</author>
+  </authors>
+  <scripts>
+    <script>wilderness.rb</script>
+  </scripts>
+  <dependencies>
+    <dependency>attributes</dependency>
+    <dependency>areas</dependency>
+  </dependencies>
+</plugin>