Merge-request: 172
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@nokia.com>

Task-number: QTCREATORBUG-2074

Task-number: QTCREATORBUG-347
Reviewed-by: ck

Task-number: QTCREATORBUG-2130

Reviewed-by: ck

Using more *::Constants::ICON_* where it makes sense and
wrapping the file names into QLatin1String where they were
missing.

The increased usage of the ICON constants needed a few more
cross plugin includes of *constants.h, here and there.
I think that it is OK, since the dependencies were alredy there
icon resource wise.

Task-number: QTCREATORBUG-1964
Reviewed-by: kh

Task-number: QTCREATORBUG-1473

Reviewed-by: ck

The search for remote content, like stl::vector in cpp-reference,
google, bing, wikipedia etc...

Task-number: QTCREATORBUG-1375
Reviewed-by: ck

Reviewed-by: ck

If a plugin requests asyncronous shutdown, the shutdown sequence does
not continue to deleting the plugins before it has sent a
asynchronousShutdownFinished signal. During that time an event loop
is running.

Task-number: QTCREATORBUG-1765
Reviewed-by: ck

If we where not in full help mode at least once, the engine
would still run without valid help collection due to the new
lazy initialisation, thus the right side pane would not be
able to retrieve the requested help file.

Reviewed-by: ck

If we where not in full help mode at least once, the engine
would still run without valid help collection due to the new
lazy initialisation, thus the right side pane would not be
able to retrieve the requested help file.

Reviewed-by: ck