Update command line help of the windeployqt tool for Qt 5.4.

Change-Id: I0c5d42e3f857fb9e12ff2e682f4949a3a7f5423d
Reviewed-by: Leena Miettinen <riitta-leena.miettinen@digia.com>
Doc: remove list of available Qt plugins

The list is outdated. Will move this information gradually
to module docs and add links to the table that lists the
base plugin classes and is updated in
924d4cd7ca5c5d226f0f195990297509353515ea.

Change-Id: I40962504ac4399ec69cd48b0ca5c74ad987b92dc
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@theqtcompany.com>
Doc: update list of plugin base classes

Sorted by Qt module.

Change-Id: I0b701acc6c4fa863a521504ae0cd6f9fa8087d80
Reviewed-by: Venugopal Shivashankar <venugopal.shivashankar@digia.com>
Merge remote-tracking branch 'origin/5.4' into 5.4.0

Change-Id: I1dcb5aab11b086551d9b6b663b3520929abdec21