VCMI will now show icons for all heroes on visible part of minimap to
help with readability on large maps
Old behavior can be enable via toggle in game settings menu
Whirlpool, Subterranean Gates, and all Monoliths now show custom popup
on right-click that show all linked objects (exits and entrances).
Only revealed objects are visible, rest are hidden behind fow.
Exits, entrances, and bidirectional objects have different icon that
indicates direction.
- added compatibility method to Canvas to allow SDL_Surface access
- added drawBorder method to Canvas to replace CSDL_Ext method
- added drawColor method to Canvas to replace CSDL_Ext method
- minor changes to Tavern and Trade windows to adapt to new API
