This reverts commit 4281de3b.

Update comments in the config on when main assets/patch.pk3 hashes have been updated (I know MS is going to update the hashes again later, but this'll still be valid to have done then).

* Update md5s.
* Update modversion.

TODO: Should we change MODID, given 2.0 apparently had a different MODID to 2.1?

Emblem and unlockable SOFTcoding! Emblems and unlockables are no longer predefined in the code and instead loaded from IWAD

* Enable SECTORSPECIALAFTERTHINK since we probably really want to use that sloped lava wave in RVZ.
* Allow for infinite lives to be set via the setlives command/Pandora's Box.
* Refactor P_DoFiring(), with guidance from Sal.
* Correct the CRAWLA HONCHO\nCAN NOW BECOME\nSUPER CRAWLA HONCHO sliding movement in non-green resolutions.

Remove all traces of "srb2.wad" support, since it is no longer needed now that srb2.pk3 is the IWAD (...IPK3?). srb2.wad cannot exactly be a pk3 file after all.

Additionally, rename any remaining "srb2.srb" to "srb2.pk3" in the main source code files. Not sure whether to bother dealing with srb2.srb/srb2.wad mentions in project files for now.

please don't make me do this again.

Core and SDL2 are two separate targets now. Core is a static library
that is linked into SRB2SDL2. The sources for both are separated.
When using an IDE like Visual Studio or Xcode, the source code
organized into groups that explain what that group of sources does.

In the future, "Main" could be split into a few more groups based on
file prefixes, but I think the way it is set up works for now.

Makefile targets are not affected by source_groups and typing `make`
will automatically compile both the "Core" library and SRB2SDL2
itself.

on non debug, check assets folder in src as well

silently fixing a bad malloc here too shhhhhhhhh