There will probably need to be more backpack config options in the future, so just make this a bit more future proof

Specifically in 2.0:
- Monitors cannot be dragged in fullscreen/player
- List monitors cannot be resized, have items added using the button or have their values edited.
- Slider monitors still work.

Including triple scrollbars on list monitors and fixing the say bubble fonts

Includes:
- context menu for switching to sliders, only on variables.
- width, height, min, max properties consumed from VM.