Also introduce mutex into DeviceContext.

Bug-number: QTCREATOR-154

The trk parts are an 'adapter' in the gdb engine.

Reviewed-by: Thorbjorn Lindeijer

Reviewed-by: Thorbjorn Lindeijer

CPPEditor::isInComment() returns if the text cursor is in a comment.

Introduce writer thread, fix message & verbose handling.

Need to check the character to the right of the cursor.

The wrong category folder (like Sources/Headers) would be deleted from
the project tree, because all category folders had the same path.
The nodes' path is used everywhere for performance optimization.

Store the file name and do not keep the QTemporaryFile around,
which still seems to maintain some kind of lock on Windows although
it is closed.

remove shutdownInferior()
rename shutdownAdapter() into shutdown()
remove errorString()
rename isAdapter() into isTrkAdapter()

remove shutdownInferior(), rename shutdownAdapter() into shutdown()