Finish first version of Twitch module

Twitch module done, has 5 commands (3 parent commands and 2 child of
!game) !game !game_gfs !game_steam !twitchupdatetitle
!twitch_updategame.  !editcom fixed and working again.  Log now can
contain the URL used to generate access codes for channel_editor.  This
build is STABLE and can be deployed assuming you have the DB structure,
which I don't have documented anywhere