[Ohrrpgce] SVN: teeemcee/8650 Implement 'asset' sprite slices, which have images loaded from a file in

[subversion at HamsterRepublic.com]

teeemcee
2017-04-18 07:22:07 -0700 (Tue, 18 Apr 2017)
331
Implement 'asset' sprite slices, which have images loaded from a file in data/ instead of the game.

Asset sprites are a subtype of sprTypeFrame, created by calling
SetSpriteToAsset on a sprite slice; like SetSpriteToFrame. (Maybe
these names aren't very good...)
The name of the asset file can be saved and loaded in .slice files.
---
U   wip/const.bi
U   wip/lumpfile.bas
U   wip/slices.bas
U   wip/slices.bi
U   wip/util.bas
U   wip/util.bi