[Config] Security Officer Scaling

Intended for high-population servers

Open security officer positions scale with population, between 5 slots at ~40 players to 12 slots at ~96 players

Default coefficient is 8, but may be modified (or disabled) in the config.

Extra lockers will spawn if there aren't enough lockers.
Resolving Conflicts:
	_maps/map_files/tgstation.2.1.3.dmm
	code/controllers/configuration.dm
	config/game_options.txt
Re-adding missing files from the last merge attempt (+2 squashed commit)

Squashed commit:

[30c5e29] Re-adding missing files from the last merge attempt

[53bcfea] Re-adding missing files from the last merge attempt
Resolved Conflicts:
	_maps/map_files/tgstation.2.1.3.dmm

...again
Resolved Conflicts:
	_maps/map_files/tgstation.2.1.3.dmm
Added some clarification in comments
Merge pull request #3941 from Ikarrus/secscaling

[MAP] [Config] Security Officer Scaling @ Round-Start