New top menu 'Styling' - change colors and other parameters

[ohlidalp]

An experiment: a new menu for adjusting fragment shader params from 'nicemetal.cg' in ManagedMaterials.

Thoughts:

• min/max values for all params are hardcoded to <-1.0 1.0>.
• param 'color' is recognized as special, all others are considered float.
• only managed materials are listed.
• only shader params are supported, although OGRE material seetings are also interesting.
• This menu could become a '.skin' editor, similarly how the Tuning menu is a '.tuneup' editor.