Right-clicking on an item in qml observer presents a context menu as
before, but instead of just selecting the item, the user enters its
context if it's possible.
A new debugger engine, QmlCppEngine, is introduced, which wraps gdb
and qml engines into one. Alternatively, if using Windows, Cdb is used
instead of Gdb.
Most of the debugger ui switcher is now rewritten, and it is tailored
for the QML and CPP layout case, the only one supported anyway.
Reviewed-by: hjk
