Update: Make *_t_clear() functionality consistent and fix existing problems.

Update: Make *_t_clear() functionality consistent and fix existing problems.

These were being removed at one point in time, resulting in an inconsistent declaration of these macros.
The memory clear macros were also removed, but some of the uses still (incorrectly) remained.

Ensure that these `*_t_clear()` macros are encased in a brace defined block.

Do not use semi-colons at the end of the `*_t_clear()` uses.
Do use semi-colons at the end of `*_t_clear()` direct property assignments.