Information hiding - moved all of command input parsing to misc.c

username-removed-1096594 requested to merge traas/open-adventure:master into master

get_command_input() is effectively an I/O function that takes raw input and makes it into a command_t. With other I/O functions, it belongs in misc.c.

This alos allowed me to make 4 other functions static, as they were only called by get_command_input();

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