Transform operator replay
Basic support working. Only saves mode and values, not constraint setup.
Removed event pointer from TransInfo (it's not available in operator exec). Replaced checks to event->modifiers to a functional modifier bitfield in TransInfo (that is, instead of checking for Shift, it checks for MOD_PRECISION) to make it remappable later.
Misc:
X-Mirror for mesh now working with transform
Transform house cleaning. Gattering input methods in specialized code. It's not missing much before it can be used standalone (for example, to use the mouse to specify remove doubles threshold interactively).
Note to Aligorith: Transformations using INPUT_NONE (most Time* stuff) would use a cleanup.
