* Animations are now millisecond-accurate, so delays in ANIMDEFS can have
fractional parts.
* Cleaned up the animation code and moved it into r_anim.cpp.
* Blood's oscillating texture animations are now available for use by actual
supported games by adding the word "oscillate" after a "range" definition
in ANIMDEFS.
* Not exactly texture animation, but it's handled in the same function as
texture animations: Scrolling skies also have millisecond precision.
SVN r125 (trunk)
