todo: special blocks

[kvnneff]

Taken from http://gtetrinet.sourceforge.net/tetrinet.txt

• 'A' Block: This is the add line block. It will add a "junk line" to the players field that you choose.
• 'C' Block: This is the clear line block. It clears
  the line farthest to the bottom in the
  playing field.
• 'N' Block: This removes all blocks from a playing
  field giving the player a "fresh start".
• 'R' Block: This removes 10 random blocks from
  a player's field.
• 'S' Block: This switches your playing field with
  another player's field depending on which
  player number you pressed. If either of
  the fields' block stack is over 16 blocks
  high, the stack will be lowered.
• 'B' Block: This removes all special blocks from
  a players field.
• 'G' Block: This "gravity" block takes all the blocks
  on the field and "pulls" them all towards
  the bottom of the field eliminating any
  gaps in the blockstack.
• 'Q' Block: This causes each of the lines of blocks
  on a players field to randomly shift left
  or right or not at all.
• 'O' Block: This is the block bomb, when used on a
  player, it clears 3x3 portions on their
  field anywhere there are 'o' blocks.
  Any blocks that were in the 3x3 areas
  are scattered around the field.