Added 2 new settings for unit health bars (fixes #3867)

Added two new settings:
- Always show status bars (can also be toggled with the `insert` hotkey). Default is off.
- Team health colors (this is a dota-style coloring for health bars: green (friendly), tan (neutral), red (enemies)). Default is off.

Selectable.cs - removed 'self' parameter from the draw *bars functions, since self is already a property of the class. The parameter is a relic from when bars used to be drawn in the WCWidget.

Also made the settings UI a bit taller.