Adding Public Works (2x2)

The public works houses town/county utility vehicles and maintenance supplies.
Added support for 2x2 buildings...

This must be placed after OMS_FLAG_ROAD, else the building attempts to rotate before a road has been drawn to connect it to a town.  Tile rotation and identification is handled in mapgen.ccp
Added Public Works spawning...

A fairly rare building, currently only 1-3 will spawn in a map but it may make more sense to balance it to 1-2.  It should be a nice surprise to find it.   

I'm not sure why but I can't get it to spawn without the mfb(OMS_FLAG_CLASSIC)... I'm not sure how many people will be offended by this since the FEMA camp also has it.
Added construction worker locker items entry...
Construction Worker Locker Items
Update Public Works 2x2 direction code...

This works better for buildings in the city where multiple sides of the building entrance face roads.
Added Hazardous Waste Sarcophagus (2x2)...

Uses the new 2x2 building code.  Only a fraction of the computer stuff is added at the moment, multi-page support is needed for the rest.
Added Hazardous Waste Sarcophagus Spawning...

Trying to keep it fairly rare.  May eventually want to set it to 1 but a max of 2 will at least let most people eventually find one.
Added Hazmatbot for toxic waste areas...

Really just a temporary re-skin of the secubot, feel free to make it a bit more unique.  A few of these act as the guardians of the Hazardous Waste Sarcophagus.
Added Hazmatbot...
Added four of the Security Reminders from the Hazardous Waste Sarcophagus
Added four of the Security Reminders from the Hazardous Waste Sarcophagus
Hazmatbot buffed to deter looting...
Merge PR #803 - 2x2 buildings (public works, HWS)

Conflicts:
	computer.cpp
	omdata.h
Add missing OMS_FLAG_2X2 and OMS_FLAG_2X2_SECOND values