Have profiling of renderloop make sense

The profiler tracking of the render loops is a bit jibberish at the moment. Even though all the render loops go through the exact same stages, the profiler integration is split into a number of render loop specific blocks, none of which make a lot of sense.

Ideally the profiler should track the following steps in the render loop:

• polish – The time items spend touching up before rendering
• sync – The time spent copying QML state into the scene graph
• animation – The time spent running animations
• rendering – The time spent in the scene graph renderer
• swap – The time spent swapping the frame to screen.

The scene graph renderer has a separate profiling hook which is a breakdown of the 'rendering' step.

The profiler frames should be changed to reflect these and the UI should be adapted accordingly.

A few of the other frame tags are also very poorly named:

• SceneGraphAdaptationLayerFrame -> DistanceField glyph preparation
• SceneGraphContextFrame -> Shader compilation