Makes known traps and event terrain effects remembered on the map and minimap...

Makes known traps and event terrain effects remembered on the map and minimap (with distinct colors for each).
Fix some bugs that was causing the nice tiler to overwrite modified grids for some events and make overlapping events behave nicely.
Adds "Lua inspect [Trap]" to the map menu in debug mode.

Note: May need new particle effects to make remembered area effects out of LOS look better.