Refactored numerous getters into setters.

Specifically, converted:

* get_list_size() to :set_int_to_list_size().
* get_string_length() to :set_int_to_string_byte_count().
* get_string_length_printable() to :set_int_to_string_length_printable().

Refactored most calls to the former to the latter. Given the ponderous girth of
the codebase, there inevitably *ALWAYS* exists more, but this should give us a
head start on the codely troubles.