Update WorldToMinimap

Changed code to provide more accurate positions on minimap when at a
distance.  Using 40 degree rotation (which should be wrong) and the
rotation formulas are also wrong according to what they should be.  It
looks much better, though.
Add Masters to minimap

Added setting for displaying Masters on minimap, currently displaying
using Ally icon, with Strongbox priority.
Merge pull request #23 from poehudcontrib/minimap_masters

Add Masters to minimap
Merge pull request #24 from poehudcontrib/minimap_positions

Update WorldToMinimap