Fixed a bug with static vehicle spawns

The filenames were a bit messed up after the change in how directories
are addressed which affected the nested directory loading of vehicles.
Refined spawning code

Added a freeze to players when they connect to the server, this is to
prevent laggy players from spawning before the spawn room objects load
as well as to prevent hackdetect teleport reports.

Cleaned up spawn code, moved common function calls for both spawn types
to a single function.

Increased sign limit, since launch the limit has only just been reached,
there's significant room for growth now with an 8x limit increase.

Added gamemode state logging (init, exit and restart)