Add comparison functors for SystemPath to compare by sector only and by system only.
Convert SectorCache to a template.
Rename SectorCache.* to GalaxyCache.*
Fixup vs2013 project
Don't assume that the master cache is the global cache.
Rename Sector::GetSystemPath to Sector::GetPath.
Use GalaxyObjectCache template for StarSystemCache.
Add a finish callback for cache filling.
Update StarSystem cache when switching spaces.
Galaxy cache usage statistics.
Decirculize Factions and CustomSystems a bit.
Move the static faction stuff to its own FactionsDatabase class.
Move the static CustomSystem stuff to its own CustomSystemDatabase class.