Ported from TG: Object armors are no longer defined in (unique) lists but rather datums that can be cached depending on their armor values.
Add LAZYSET define to lazily initialize a list then assigning a key to a value
Add alldirs2 global which is the same as alldirs except diagonals go first
Optimize mob memory by making alerts list lazy
Optimize obj/machinery memory by making use_log and settagwhitelist lists lazy
Optimize atom memory by not creating hud_list list for all atoms
Optimize turf memory by not creating footstep_sounds list for all turfs
Clean up code where possible
