Cleanup dedicatead server null files.

Unused functions removed.
client.h no longer included, use the exe_headers where necessary in client/snddma.
Removed some cruft from MP win_wndproc.cpp.
Fixed issue on windows where pressing alt key while in windowed mode would cause a delay because of the key menu.
AKA (Alt+F = File menu in most programs)
Updated fork links in README
Change default mod GAMEVERSION description in README.md
Restart game module on map_restart properly. Should fix #111
Fixed crash when using 'forcenext'.
Revert weapon pickup change causing base incompatibility. Fixes #383
Add clientNum as another argument to "chat" reliable commands for better client identification by mods
Clean up score/teaminfo parsing on client
Improved .sab parser. Speed and size safety
Add log entry for renames.
Filter out more than 2 @ symbols in a row in names to prevent use of @@@MENUS_* etc.
Validate userinfo on connect as well.
Set the correct playerstate groundentitynum in ClientSpawn.
Setting the entitystate version causes it to be overwritten by BG_PStoES.
Display Padawan name in failed connect log message if no name was found.
Set "Bot" IP in session information for use elsewhere.
Fixed turret that gets killed by a nodrop volume not clearing the owner's already placed state.
Don't ever set groundentitynum to -1.
Fix tcmd to directly send as a forward-to-server cmd.
Fix tcmd so that it works with crosshair player being 0.