[Doctrine] Reimplement Model/Entity detection

[Haehnchen]

currently the doctrine Model/Entity classes are detected in a very tricky way. use a indexer an parse classes names out of the metafile. this implementation helps also to support other non symfony+doctrine projects

mongodb.xml
orm.xml
couchdb.xml
annotations?

also implement missing features of #319

[kick-the-bucket]

Would be really great to be able to use this plugin on non-symfony + doctrine projects :)

[Haehnchen]

i am working on it 😎

[Haehnchen]

ready