Revert "remove warnings from build.properties"

This reverts commit 7e285f5a724159cd6de38cdd9aef24abb5344ddc.
remove plugin.xml from build.properties
fix maven import of org.jboss.tools.hibernate.jpt.core.test
Revert "remove dead code warning"

This reverts commit 66398574cc3032a3f02745b857e49ad84f241f8f.
JBIDE-10219 Migrate org.eclipse.core.runtime.contentTypes extension points to org.eclipse.core.contenttype.contentTypes
remove unnecessary .settings/ folders
remove .cvsignore files