Fixing Android builds with missing dependencies, making sure templates are up to date. Fixing include.xml as well for that

dependencies/extension-api/build.xml

@@ -0,0 +1,13 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project name="OpenFLExtension" default="help">
+	
+	<property environment="env"/>
+	<property name="sdk.dir" value="${env.ANDROID_SDK}"/>
+	
+	<property file="local.properties"/>
+	<property file="ant.properties"/>
+	<property file="project.properties"/>
+	
+	<import file="${sdk.dir}/tools/ant/build.xml"/>
+	
+</project>