Added MetaRotate/Mirror Support for a number of classes.
Changed Rotater to Rotator.  Added partial sign post rotation support.
Fixed spelling; Rotater to Rotator.
Added a comment about the behavior of doors under mirros.  Simply put, the current implementation of MetaMirror causes glitchy behavior.  The door class itself needs to be edited. (I've got an idea on that....)
Fixed Minor typos.
Altered the rotates for cBlockSignHandler.  The functions as a whole is still unfinished though; no wall sign or mirroring support yet.
Added in MetaMirrorXY and MetaMirrorYZ to cBlockSignHandler.
Merge pull request #834 from narroo/issue503

Issue503 pull Request