Remove unused get_escape_seq_kbinput() function
Remove unused get_escape_seq_abcd() function
Remove unused get_byte_kbinput() function
Remove unused add_unicode_digit() and get_unicode_kbinput() functions
Remove unused get_control_kbinput() function
Remove obsolete comment
Change 'poshistory' into std::list instead of a pointer to the head of a linked list structure
Change 'allfuncs' to be a std::list<subnfunc*> instead of a pointer to the head of a linked list
Remove unused 'currshortcut' global
Remove declaration for sc_init_one() function which is never defined or referenced
Remove unused 'shortcut' struct
Change 'sclist' to be a std::list instead of pointer to the head of a linked list struct