SLING-2989 - [Tooling] integrate with vlt once available

Take into account more vlt-supplied information about the serialization
format.

git-svn-id: https://svn.apache.org/repos/asf/sling/branches/tooling-ide-vlt@1522921 13f79535-47bb-0310-9956-ffa450edef68
Add copyright information to features

git-svn-id: https://svn.apache.org/repos/asf/sling/branches/tooling-ide-vlt@1522922 13f79535-47bb-0310-9956-ffa450edef68
SLING-3056 - [Tooling] Separate m2eclipse dependent extensions from
others, in slingclipse

Remove leftover m2e imports

git-svn-id: https://svn.apache.org/repos/asf/sling/branches/tooling-ide-vlt@1522923 13f79535-47bb-0310-9956-ffa450edef68