Hovering Healthbar Proof of Concept

Added initial proof of concept for Agent healthbars over the combat map
- Healthbar is only visible if the current health of the agent is less
than its maximum

Rearranged some ability code
The name of the currently highlighted agent is now displayed on the
combat map menubar
When the cursor is over a tile on the combat map, the tile coordinates
are displayed on the menubar instead of the cursor coordinates in pixels