Add COM_LUA to a bunch of commands

These commands be run from Lua:

- add
- addfile
- addfolder
- archivetest
- ban
- banip
- causecfail
- cecho
- cechoduration
- cechoflags
- changeteam
- changeteam2
- charability
- charspeed
- cheats
- clearbans
- clearscores
- connect
- countmobjs
- csay
- demote
- devmode
- displayplayer
- downloads
- drop
- droprate
- dumplua
- echo
- exitgame
- exitlevel
- gametype
- getallemeralds
- getplayernum
- god
- gravflip
- help
- hurtme
- isgamemodified
- jumptoaxis
- kick
- listwad
- login
- manual
- map
- mapmd5
- masterserver_update
- memdump
- memfree
- mod_details
- motd
- noclip
- nodes
- notarget
- numnodes
- numthinkers
- objectplace
- password
- pause
- ping
- playintro
- promote
- quit
- reloadbans
- resendgamestate
- resetcamera
- resetemeralds
- restartaudio
- retry
- rteleport
- runsoc
- savecheckpoint
- say
- sayteam
- sayto
- scale
- screenshot
- serverchangeteam
- setcontinues
- setlives
- setrings
- showbanlist
- showmap
- showscores
- showtime
- skynum
- startmovie
- stopdemo
- stopmovie
- suicide
- teleport
- toggle
- togglemodified
- toggletwod
- tunes
- version
- vid_info
- vid_modelist
- vid_nummodes
- weather