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

A mostly mechanical change.

Reviewed-By: con

Reviewed-by: ck

Reviewed-by: ck

 - lessens open file handles
 - improves help plugin startup further

Task-number: QTCREATORBUG-337
Reviewed-by: ck

Reviewed-by: Leena Miettinen

Reviewed-by: ossi

When changing the language, the sidebar items would break because
their localized window titles were used for storing the settings. Now,
id's are used.

Reviewed-by: con

Discussed-with: hjk

* Make sure we only change our own urls inside that function
* QDesktopService::setUrlHandler expects the target slot to take a QUrl

Reviewed-by: ck

Also put it at the top, since it looks better there with the icon.

Reviewed-by: ck