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

Rename arguments to allArguments(), qmakeArguments() to userArguments()

Fix for that will come later

instead of a Project. Since BuildSteps "should" only care about the
BuildConfiguration not the Project. (Not 100% doable, but still.)

Note: I didn't fix all the connects and there are a few missing things.
This compiles, more work is coming.

The pointers can be used to distinguish BuildConfigurations