Fixes issues with handling additional dots in the filename in many
places.

Task: 246390

Details: Use a global model for nicknames that is shared by all dialogs to solve the updating  problems. Make p4 plugin submit work again. Force a submit prompt in case of shutdown or editor close (as opposed to user clickling on "Submit").

Fixes: Add common configuration to the VCSA base plugin; submit message check script and user name configuration.                                           Details: Extend submit editor widget by configureable fields. Use them in the VCS base submit editor to specify users, provide completion and selection dialog for them.

Task:     - 244529
Details:  - It just doesn't work in Mac menus (at least not with Qt, but
I suspect it's some Mac thingy), so just don't do it.

context

Details:  more consistent with the File menu

Many singletons have their own instance() method, in which case there is
no need to use ICore::instance() to get access to them.

replace ExtensionSystem::PluginManager::instance()->getObject<Core::ICore>() by Core::ICore::instance()

forward declaration is sufficient.

Details:  - Naming convention

Details:  - Conform to naming convention

Details: Refactor the git command to be able to run a batch. Run diff and diff --cached in a batch

Details:  - To make it conform to naming convention.

Fixes: Random enabling of submit/diff buttons when switching contexts (viewing diffs) from the submit editor

Details: Register actions directly

Fixes: Make git diff work for staged files, do not launch submit if file list empty, make file  model read only, add conveniences

Details: Add a type data field to the git file model

Task: 205821
RevBy: con
Details:  Add a IVersionControl to git. Extend IF to able to return a name and add enabling options. Connect project explorer to enable the right VCS.

Task:     -
RevBy:    -
AutoTest: -
Details:  -