Refactor: Append '_t' to all types and related macros.

Refactor: Append '_t' to all types and related macros.

After using uint8_t and similar, I have decided to adopt the '_t' notation for types.
This helps further reduce the possibility of naming conflicts.
With this change a function, for example, for file mode could be 'f_file_mode' whereas a type for file mode would be 'f_file_mode_t'.

This further allows me to change the design of the *int*_t types used as an array.
Such as renaming 'f_uint8_tss' to 'f_uint8ss_t'.