* moved the sprite renaming out of the file system entirely into a caller-provided callback.
* renamed several functions to closer match the terms of a file system.
* moved the VM interface out of the implementation.
- replace swapvalues with std::swap globally.
- added some additions to utility code from Raze, mainly to reduce file content differences.
- reduced some unused utilities
Mainly done to isolate the calls that actually manipulate the global frame buffer.
V_Init alsoi initialized some palette data, which was moved to V_InitPalette and did something entirely different when running a restart as opposed to an initial start.
