Re-Design of SpacePartitioningGrid for reduced memory footprint.
Added null-setting and GC sweep request of previous Mission in Game.
Bugfix: ResourceManager texture cache susceptible to hash collisions if
two textures of same nane but different palettes are applied.
Bugfix: Concurrent co-modification in WorldObject with new
SpacePartitioningGrid.
Merge branch 'master' of https://github.com/jtrfp/terminal-recall.git