Routines
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F7AB: Initialise and execute an interruptible subcommand
Used by the routines at 62DB (to activate the sniper) and F748 (to make a character start walking up or down to his next walkabout destination).
Input
BC Interruptible subcommand routine address (621E, 7A57 or F6E9)
H Character number (0xD7-0xE5)
F7AB PUSH BC Push the interruptible subcommand routine address onto the stack in preparation for an indirect jump
F7AC LD L,$0E Copy the interruptible subcommand routine address from BC into bytes 0x0E and 0x0F of the character's buffer, and then jump to it
F7AE JR $F7A7
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