Some code cleanup.

See merge request STJr/SRB2!298

Winsock error handling fixes

See merge request !303

File loading hotfix

See merge request STJr/SRB2!310

Make sure handles of files opened by W_LoadWadFile are closed if we abort loading the files for whatever reason.

ESPECIALLY if the file is already loaded in SRB2, that's just silly.

Patch offsets fix

See merge request STJr/SRB2!305

MI minor refactoring

See merge request STJr/SRB2!294

Multi-patch texture support for transparency AND translucency

See merge request STJr/SRB2!293

now that V_FLIP's effects are always supported in V_DrawFixedPatch, there's no need for the "flip" variable anymore

HWR_DrawFixedPatch: Add V_OFFSET support for V_FLIP in hardware code as well, also add missing SHORTs for gpatch fields

Make V_OFFSET no thing without V_NOSCALESTART, to remove any potential glitches with using it on its own

Use temporary buffer with a max size of 255 bytes instead of having Microsoft's FormatMessageA alloc one for us. Also, provide a fallback message in case no message was available for some reason

Save the result of errno (aka WSAGetLastError() for WinSock) as soon as possible, to prevent anything in SOCK_GetNodeAddress resetting the value to 0 while trying to print the message for the error itself!

Creating a quick get_WSAErrorStr function to act as a wrapper for FormatMessageA so we can string-ify Winsock errors properly

Untested!

mapheader lua unarchive hotfix

See merge request STJr/SRB2!302

Apply music code cleanup changes

See merge request SteelTitanium/SRB2!1

Music Code Cleanup

See merge request STJr/SRB2!278

Handle fix for SDL Mixer

See merge request STJr/SRB2!301

More accurate GIF delay

See merge request STJr/SRB2!276

MI's unimportant code cleanup

See merge request STJr/SRB2!295

I've voided this out on other sound interfaces than SDL Mixer ones because I'm both not sure whether they need it, and not sure how to make them work with it if they do.

No longer needed as S_RegisterSoundStuff will return early if in
dedicated mode.

Remove "playerdeadview" variable; it's not been used for its stated purpose for who knows how long now

Besides rankings popping up when you die just sounds weird anyway, maybe I'm just used to SRB2 not doing it I guess

Remove unused ObjectPlace_OnChange prototype (from when Objectplace was a consvar, which it is not anymore)

Also corrected what appears to be a typo in some comments above?

(it's only set to 0 in software, and only ++'d in OpenGL, what kind of sense does that make?)