And ensure that the menu items don't vanish from the application menu
when they are translated.

- Saving to file only takes modified data into account.
- Search functionality does not exhaust memory anymore.
- Searches can be canceled. This required updating the IFindSupport
  interface and all classes implementing it. No functional changes
  were done in those.

Reviewed-by: mae

Creator would get darker and darker when dragging or clicking the mouse.
Don't paint the editor indicator when there is no view or the view has
editors.

Reviewed-by: mae
Reviewed-by: Daniel Molkentin

focus in events resulted in currentEditorView() being 0)

Previously, the image used as background forced it to be white, which
made the text impossible to read when the palette foreground color
happened to be white as well.

Task-number: 258167

Solves a problem with infinitely running QProgressBar animation in
QMacStyle.

Reviewed-by: Roberto Raggi

also when a context menu action is selected.

This allows the user e.g. to select and run a specific run
configuration with one click.

In NavigationSubWidget and SideBarWidget

Reviewed-by: hjk

And adapt the device selection list.

This removes the all hard dependencies to and from welcome screen,
except the one to the core plugin. More in detail:

- Add IWelcomePage to add a tab to the welcome screen
- Move tabs in the modules where they belong
- Enables QHelpManager to open help fullscreen and contextually
- "Getting Started" moves to Qt4ProjectManager
- Projects & Sessions (aka "Develop") moves to ProjectExplorer
- "Community" remains in the welcome plugin for simplicity

Broke with 61e468a8.

If we are going to be uncertain, then let's try to
be somewhat better stylistically about it.

This happens for example when removing a split editor.

Details:
The fade-in is a lot faster now, to
prevent things from feeling unresponsive.

This commit makes the uglyness of our current default arrow
icons visible. The toolbuttons are also too wide.

This is a fix for the problem, that some users were unable to figure
out how to open projects.

RevBy:    dt