Revert "[MP] Fix from Tequilla's ioq3 commit g_mover.c in part of ioquake/ioq3@223b851b7ba8fc052eb16a830d3a79b994857884"

This reverts commit 8978e9a4618a06efc6cc4c24abee0be695e32aa9.
This commit fixes #595.
Clarify approach to issues that aren't bug-related
Clarify that SDL2 is required on non-Windows.
[MP] Don't crash if a searchpath does not contain a path separator - it could be under the current directory
[MP] Allow stencil shadows to render for surfaces with > 500 vertices
Patch by ZTM for ioquake/ioq3 and adapted by Ensiform
[MP] More sane limits for cl_maxPackets
[SP] Allow stencil shadows to render for surfaces with > 500 vertices Patch by ZTM for ioquake/ioq3 and adapted by Ensiform
Update CHANGELOG.txt
[MP] Cleaned up broadcastClients usage
[MP] Fix last commit...
Fix for issue #597
[MP] Actually fix previous commits.
[SP] Fix compiler warnings
[JK2] Fix compiler warnings
[MP] Fix compiler warnings
[MP] Add stub UI script cmd for LaunchSP.
[SP] Add stub UI script cmd for LaunchMP.
[MP] Tidied up some of the CMake files.

In the vanilla renderer CMake file, I've renamed the 'qcommon' group
to 'common', and in the bot lib project, moved all the files into the
correct groups.
[SP] Fix Linux builds
[SP] Fix the fix for Linux builds.

__STDC_LIMIT_MACROS must be defined in C99 versions of the stdint.h header in
order for SIZE_MAX to be defined.