A mostly mechanical change.

Reviewed-By: con

Fix breakage introduced by:
59237338

Make it possible to trigger actions from the locator bar by
registering an instance of Locator::CommandLocator by prefix.
Currently used for VCS systems.

Acked-by: con
Initial-patch-by: Roberto Raggi <roberto.raggi@nokia.com>

Add repository creation operation to IVersionControl, implement for hg
and git, add convenience slot with prompts to VCSBasePlugin.
Add respective menu options and make menus are visible in case no VCS is
active.
Change project wizards extension page to list VCS that are capable of
repository creation in a QComboBox in case the directory is not managed
by another VCS (in which case it lists that one for operation 'add').
On that occasion, polish the Project selection to use a QComboBox as
well and add some smartness to find the most suitable project to add via
path matching.

...and its dialog prompt consistently. Rename method and
introduce overload taking IVersionControl. Add convenience slot to
VCSBasePlugin.

Task-number:   QTCREATORBUG-503

Make use of VCS base class.

Add a QVariant cookie to HgTask to be emitted on successful
execution, wired to IVersionControl.

Start the jobrunner on demand, save options only if changed,
give it the structure used elsewhere in the VCS plugins. Remove
last traces of the cmd /c hack.

Do not use "cmd /c hg" on Windows as this will fail randomly
depending on arguments with blanks, such as "-U 8". Output log
messages about synchronous commands, format author correctly,
label menus correctly.

Polish: Canconical slots, const-correctness, some QLatin1Strings/tr,