Projectile::applyAccuracy() - adjust & simplify Throwing deviation.

calculateThrow()
	- prevent thrown items from landing on diagonal BigWalls.
	- in addition to same in TileEngine::validateThrow()
- delete too-clever-by-half crap.
	- more to go!
RNG: don't use stl functions for varnames ....
	- it screws up my color scheme in Code::Blocks.

MAP: adds to TerrorShip #5