Persons now spawn with random color
Changed HealthPacks to DropPacks.

DropPacks replace HealthPacks because now there are point packs and health packs.
Host is now always a cyan triangle.
Boss zombie now takes shorter route to target.
Zombies can now set the the additional cost of breaking down a building in pathfinding.
Cleaned up the zombie related classes a bit.
Errors while contacting the update site don't print the stack trace.
Fixed bug where zombies would move before a path was created.
Merge branch 'master' of https://github.com/xuset/TriGame