QmlProfiler: Pass input events with the same signal as all others

Change-Id: I1d2e4da0ffe4772acff95ec27d5459309d41aa60
Reviewed-by: Kai Koehne <kai.koehne@digia.com>
QmlProfiler: Increase minimum size of timeline items to 3px

One pixel wide lines are too hard to spot.

Change-Id: I94f71ba4305078d8682673618be0f5a5e1f85ba8
Reviewed-by: Kai Koehne <kai.koehne@digia.com>