Slider UI style improvements for cba_settings

[mharis001]

When merged this pull request will:

• Fix overlap between sliders and their associated edit boxes
• Use 3DEN controls arrow images for sliders, combo boxes, and scroll bars
  • Somewhat subjective which is better but I think the filled arrows look better

Images

Before:

After:

[commy2]

For combo menus we change the icons to the 3den icons by creating a new base class GVAR(RscCombo) that inherits from RscCombo.

For sliders we change the base class from RscXSliderH to ctrlXSliderH.

Why?

[mharis001]

For combo boxes, a new base class is created because we want to keep the font, font size, colors from RscCombo. The 3DEN equivalent base class (ctrlCombo) has significantly different visuals and would look out of place in the UI without tweaking.

I decided it was easier to change the image paths from RscCombo than the fonts/colors from ctrlCombo. Either way, would require a new base class.

For sliders, RscXSliderH and ctrlXSliderH are (for the most part) the same except for the image paths.

[commy2]

Okay, GVAR(RscCombo) is a hybrid with RscCombo text style and ctrlCombo icons, while ctrlXSliderH has no text.