What changed in EDuke32, build by build

Replace the osdcvar_t members that needed to be kept in sync with cvar_t with an actual cvar_t. If this is questionable for any reason I'm forgetting, feel free to revert!

Fix DirectSound in MSVC builds and remove the dependency on the DirectX SDK

Revert "Implement fullscreen 8bpp mode as a borderless, desktop-sized window when running on Windows, and expose an 8bpp mode to the game with the same size as the desktop when no fullscreen 8bpp modes are exposed by Windows. This is required on Windows 8 if we want to have any operation of classic mode in fullscreen, because Windows 8 drops the ability to set any mode other than 32bpp (leaving us largely in the same position we are when running under X)."

Fix building as C instead of C++

Revert "compat.h: slightly reformat the NOWARN-related preprocessor directives."

Fix a keyboard scancode oversight I introduced with my changes last night, apparently caused crashes

MinGW C build fix

Fix the warnings when building with C++, add MSVC C++ build support. This also changes the internal type of lotags, hitags and cstat type fields to uint16_t instead of int16_t to clean up some dubious behavior wherein the code was using a value of 32768 as a flag in these fields for certain types of things, like invisible sprites (using the value as if it was uint16_t) where it was elsewhere checking if the value was < 0 (using the value as if it was int16_t). This change may break a few specific effects if any part of the relevant code was missed when looking for areas that needed to be addressed.

Fix r3155 fuckup :)

Fix useractor enemystayput breakage

Fix C90 compliance warning in sdlmusic

Fix warning from r3128

Fix console key changing breakage

Hopefully fix the projectile breakage, and add some predefined names for working with the built in statnums

A pretty useless fix from a newer version of kplib than we forked from. I'm just tired of seeing it in my tree. ;)

Oops! Fix MinGW build issue caused by ripping out nedmalloc

A potential fix for MUSICANDSFX problems after loading a savegame. I was never able to reproduce the issue myself, but something like this seems like a good idea anyway. Thoughts?

Remove some outdated/incorrect code that was causing some issues when multiple copies of a single sound were playing and just one of them needed to be stopped.

Fix setting r_pr_maxlightpasses from .cfg at startup

Add cvar "cl_runmode" to control ud.runkey_mode. This should fix the "allow walk while running" preference not saving.

Fix the bug I caused with custom projectiles :p

Fix issue with explosion sound cutoff in E1L2. This implements functionality to stop playback and free up the voice of a currently playing sound of the same ID when there are already MAXSOUNDINSTANCES (currently 8) of the same sound playing, determined by distance/volume and which sound is oldest.

Minor cleanups in actors.c, mostly relating to custom projectiles and the like. A bug causing custom projectiles to knock the player back twice as far as the hard-coded ones was also fixed. There should be no other functional changes for the end user.

Fix a.masm changes so MSVC builds work again. The relevant functionality seems to work (non-power of 2 textures drawn without error), even with CLASSIC_NONPOW2_YSIZE_WALLS defined in engine.c, but I'm not familiar with any corner or edge cases that need to be watched out for with this.