Locomotion and state checks

[Peter Tigges]

With these checks in place, you would no longer be able to stand up while incapacitated, for instance.

Relevant data can be found in command_table.iff See the locomotion and state columns. Check against what the executing player has in terms of locomotion and state and make it fail if necessary.

When failing, send message: "You cannot (COMMAND NAME) while (LOCOMOTION/STATE NAME)"

See cmd_n.stf, locomotion_n.stf and state_n.stf