Merge FE_SRC_LIBS into FE_SRC_COMMON

Maven doesn't like multiple source roots..
Update POM with FMLCorePlugin manifest entry and AT resources
Update Maven POM to inherit from ForgeMod
Update group ID
Update parent POM version
Remove synthetic method workaround, no longer needed in latest SS
Merge branch 'maven-dev' of https://github.com/agaricusb/ForgeEssentialsMain into experimental

Conflicts:
	pom.xml
	src/FE_SRC_COMMON/com/ForgeEssentials/core/commands/ForgeEssentialsCommandBase.java