Solve Issue 624: minimap multiple selection tool

Adds a circle when you mouse over the minimap, beneath your cursor
-This circle is the effect range of your right click+mark
-Shift+scroll to change the size of this circle (ExodusMinimapAreaEffect)
-- Set the debug to 1 to have basically the same range as before (unless dots are stacked)
-This circle is also how many avatars are shown in the tooltip
-When this circle is over avatar dots, they change color (ExodusMapRolloverColor)
The menu functions still only work on the closest dot to your cursor on right click...
Thanks to Exodus for the majority of this code, the rest is my work and updates to be closer to LL in places.