Migration from legacy edit modes to SBL modes

• all params are in original order, where output variables go after input arguments (create_player 0 0 0 0 store_to $player1)
  • SB4 provides special syntax, where outputs in an assignment expression can be listed on the left-hand side, e.g. $player1 = create_player 0 0 0 0)
• command name can be used as a keyword instead of opcode (shake_cam 100)
• Actor is called Char
• Marker is called Blip
• Model class no longer exists, its methods can be found in static Streaming class
• $PLAYER_CHAR replaced with $player1
• $PLAYER_ACTOR replaced with $scplayer
• angle is called heading
• thread is called script