* Merge BuildSettingsWidget and BuildSettingsSubWidgets. I don't
   see much need for this separation and it makes the indention harder
   to do.
 * Override contentsmargins set by the ProjectsWindow.
   This enables the toolwidget to be displayed properly.
 * Add a remove button to the toolwidget of the buildsteps. Remove the
   global one.
 * Simplify code a bit by using QSignalMapper instead of mapping signals
   manually.

Reviewed-by: dt

 * Indent widgets using contentsmargins. That way the individual
   widgets can override this.
 * Remove spme spacers in favour of yet more contents margins.
 * Remove unused headers and forward declarations.
 * Define some constants for spacings we might want to tweak later on.

Reviewed-by: dt

 * Make toolswidget appear on hover.
 * Use a cached gradient in the background.
 * Remove layout fixup as that does not help on Linux and Windows
   anymore. Reevaluate after testing on Mac.

Reviewed-by: dt

Allow compiling with older Windows SDKs, link ole32 explictly.
If you want this feature to work, you need to compile and test
it on Windows 7.

Task-Number: QTCREATORBUG-252

Also rename some methods/signal to make clearer that those only are
relevevant for user changes not for all arguments.

the fix makes the mouse cursor visible when the editor loses focus.
This fixes an issue with the completion box, where on mac and windows
no mouse cursor would be visible (it worked on X11 due to the way
X11 does mouse grabbing for popup windows).

Introduce "Reset Font Size" action, bound to Ctrl+0

Task-number: QTCREATORBUG-364

Remove overlap. Add extra selection tooltips for the cpp hover handler.

Check for correct state (InferiorStopped).

Instead of relying on magic in setFocus(TabFocusReason) use selectAll()

Task-number: QTCREATORBUG-369