Simple UI Improvements for complex scenes

Few ideas:

1. Decouple coloring of the following Wire type objects in the 3D viewport Theme settings:

• Empty Object -> RGBA
• Lattice -> RGBA
• Curves -> RGBA
• Other wire objects that I not listed above -> RGBA
• Extra -> Numerical value based line width (thickness )settings for these wired objects.

Use case:

A. a scene with plenty of empties curves lattices -> u cannot distinguish anything.

2. Enable to chagne the view port colors of wire objects or wires per object in the Object Properties/Viewport display settings.

3. Decouple UI line width form 3D objects line width

( Preferences/Interface/Display -> Line width ) Would be nice to contorl the edge width (numericaly) in the 3D viewport, without fu**ing up all the UI line widths.