- added SGCommandState class so that commands can compile and save   copies of their arguments - modified prototype for command functions -- they now take a pointer   to a pointer of an SGCommandState object (which they will normally   subclass) so that they can cache state between invocations - commented out convenience execute methods until they're actually   needed
- added SGCommandState class so that commands can compile and save
  copies of their arguments
- modified prototype for command functions -- they now take a pointer
  to a pointer of an SGCommandState object (which they will normally
  subclass) so that they can cache state between invocations
- commented out convenience execute methods until they're actually
  needed

slowriot/simgear,slowriot/simgear