Update: Consistency improvements with *_append() and *_append_all(), add tests, and...

Update: Consistency improvements with *_append() and *_append_all(), add tests, and other clean ups.

The array functions for managing structures needs to be consistent with the *_append() functions.
This introduces the *_append() all across the board.
The previous *_append() behavior is essentially refactored into *_append_all().

The *_append() now accepts a single type for a given structure rather than a set.
(The single type can still be representative of a set itself.)

Add a lot of tests.
Add missing f_iki tests.
The f_string tests are not fully implemented, the f_dynamic_* functions are only partially tested.
All of the other f_string structures should be fully tested now.

Make the macro_f_string_range_t_initialize() macro consistency with all other macros.
That is, the macro initialize that does not have a digit initializes using all of the structures members.
This effectively refactors macro_f_string_range_t_initialize() into macro_f_string_range_t_initialize2() and macro_f_string_range_t_initialize2() into macro_f_string_range_t_initialize().

Change the behavior of the *_resize() and *_adjust() functions to return F_none rather than a direct f_memory status code.

Update some of the string functions to return F_data_not_eos.

Restructure some of the code to be a bit more organized.
Specifically, the f_iki_data_t is moved into its own source and header files.
Reduce the clutter in some of the private source and header files by moving some of their content into separate individual files as appropriate.