[MP] Win32: Fix game reporting low memory status.

GlobalMemoryStatusEx requires the dwLength field of the MEMORYSTATUSEX
struct to be filled in by the caller.

This fixes strange actions being performed by the game such as s_khz being
set to 11 on start up. This should also improve performance in some cases
where the game doesn't try to free memory when it didn't need to.
[MP] Win32: Fix server reporting low memory.

Same fix as previous commit for client binary.
[SP] Win32: Fix game incorrectly reporting low mem

GlobalMemoryStatusEx requires the dwLength field of the MEMORYSTATUSEX
struct to be filled in by the caller.

This fixes strange actions being performed by the game such as s_khz being
set to 11 on start up. This should also improve performance in some cases
where the game doesn't try to free memory when it didn't need to.
[MP] Make cl_motd archived and an index to which cl_motdServer is used.
Add cl_motdServer1-5.  1 is default, 2 is jkhub, 3-5 are unset by default.
Set cl_motd to 0 if you want to disable the Welcome player message entirely.
Merge branch 'master' of https://github.com/JACoders/OpenJK