(split) qtjambishell_signals_cleanup
(split) qtjambishell_signals_cleanup

Provide a way to cleanup signal wrapper related stuff on shell
 object destruction.
This ensures out Java reference(s) get cleaned up.
Also the QTJAMBI_DEBUG_TOOLS related debugging is freed.

Change-Id: Ic46f0aa6fc5b42de7654cf22b5abdd9623060451

qt-generator/qt-generator,qt-generator/qt-generator,qt-generator/qt-generator