Updated and Modernized LMCTF 5.2 TE codebase for Windows, Linux, OSX

[QwazyWabbit]

https://github.com/QwazyWabbitWOS/lmctf60.git

This code is based on the archive recovered by the team at https://www.lmctf.com/index.htm

I've cleaned it up and brought the code up to more current usage per ISO C11 and it now compiles without warnings or errors on Linux, Windows and OSX on Visual Studio 2019, GCC and clang. The code in the original ZIP has a gravity tweak that didn't appear to have a logical reason but I left the code in place and added a macro to turn it on if some really wants it that way. See my discussion in the issues tab for the repository, Issue #1.

Linux admins: git clone https://github.com/QwazyWabbitWOS/lmctf60.git
then
make (for x86_64 build)
or setarch i386 make (for i386)

Copy/rename the binary as needed.

Warning to Windows  VS2019 users: The project is currently set to build straight into the c:\quake2\lmctf folder for debugging purposes so be sure to backup your older gamex86 binaries before building this. When switching from Debug to Release builds, be sure to do a Rebuild solution to fully build the objs and binary.

Q2admin users, rename the binary to gamex86.real.dll or gamei386.real.so to allow q2admin to cascade to it.

Modders: If you make changes, please fork the repo and post pull requests so I can keep it current. Thanks.

QW