Remove extra magnitude from magic texture mapping values

- These used to be fixed point, but now they're floating point, so the
  excess magnitude is unneeded.
Remove DepthScale and DepthOrg from FWallTmapVals
Merge branch 'master' of github.com:rheit/zdoom
Merge branch 'master' of https://github.com/rheit/zdoom into openal
Reorder pick parsing to require one parameter.

- This function is pointless without any parameters, so don't allow that.
Merge branch 'master' of https://github.com/rheit/zdoom into openal