Changes most of the special keys used in the main input loop
into extended commands:
- movement keys are now bound to extended commands, eg.
#movewest and so on.
- m-prefix is now #reqmenu extended command, still bound to
the 'm' key.
- run, rush, and fight are now extended commands, still bound
to the same keys as previously.
- nopickup and runnopickup keys are removed.
Nopickup was using 'm' key, the same as the m-prefix, so
allow #reqmenu to modify movement commands to disable pickup.
- multiple prefix commands are allowed. This lets user to
use #reqmenu, followed by #run, followed by movement to simulate
runnopickup behaviour. (If necessary, adding runnopickup back
as an extended command would be easy)
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