[MP] Change engine cmds to avoid collision with mods.  Prefixed with sv_ now.
[MP] If client is missing snaps userinfo entirely, use maxSnaps.
Also make sure to avoid snapshot desync on update of snaps userinfo change.
[MP] Unused ProcessNewUI prototype
[MP] Minor cleanup in win_input.cpp
[MP] Add svtell command to send message to clients from server console.
[MP] Update gender hinting code a bit so male is default instead of female.
[MP] Partial fix for rotate pic.

Refs #584
[SP] Partial fix for rotate pic.

Refs #584
[JK2SP] Improve the set force cmds from JASP.
Added SVF_BROADCASTCLIENTS to stop specified entities being broadcast to certain players
[JK2SP] save files have screenshots again

Breaks save compatibility with earlier OpenJO versions.