- Ported the 0.2.0's channel changing functions

- Ported the 0.2.0's channel changing functions
- Cosmetic changes : the word 'vlan' is disappearing
- network_ChannelJoin is still commented out as it's not in sync anymore
  with our channel server. Nitrox should fix this within a week.
- X and Xv output : added autohide cursor as in SDL
- X and Sv : keys 1 to 0 change channel
- SDL : keys F1 to F10 change channel as I was not able to make 1..0 work