Add the new utils plugin, change entity spawning and the lookup command plugins to use it.

data/plugins/util/plugin.xml

@@ -0,0 +1,17 @@
+<?xml version="1.0"?>
+<plugin>
+  <id>util</id>
+  <version>1</version>
+  <name>Util</name>
+  <description>Adds utility methods for plugins.</description>
+  <authors>
+    <author>Major</author>
+  </authors>
+  <scripts>
+    <script>command.rb</script>
+    <script>intercept.rb</script>
+    <script>item-on-item-intercept.rb</script>
+    <script>name-lookup.rb</script>
+  </scripts>
+  <dependencies /> <!-- This plugin should _NOT_ depend on anything. -->
+</plugin>