Custom Tapping Term per key (#5009)

* Add customizable tapping terms

* Add Documentation

* Fix function

* Fixes

* It's not a pointer

* Add debugging output

* Update documentation to be at least vaguely accurate

* Use `get_tapping_term(tapping_key.event)` instead

`e` doesn't include column and row information, properly. It registers as 255, regardless of the actual keypress.

However `tapping_key.event` actually gives the correct column and row information.  It appears be the correct structure to use. 

In fact, it looks like the issue is that `e` is actually the "TICK" structure, as defined in keyboard.h

* Use variable tapping term value rather than define

* Silly drashna - tapping_key.event, not event

* add get_event_keycode() function

* Fix typo

Co-Authored-By: drashna <drashna@live.com>

* Remove post_process_record_quantum since it's the wrong PR

* Update quantum/quantum.c

Co-Authored-By: drashna <drashna@live.com>

* Better handle ifdef statement for permissive hold

Since we can't be sure that tapping term is actually 500

* Update quantum.c comments based on feedback

* Clean up get_tapping_term function

Clean up function so that users don't need to call the event function, and instead only check the keycode

* Add ability to run functionality on and off

* Make ifdef's more compact

tmk_core/common/action_tapping.h

@@ -35,6 +35,8 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
 
 #ifndef NO_ACTION_TAPPING
+uint16_t get_event_keycode(keyevent_t event);
+uint16_t get_tapping_term(uint16_t keycode);
 void action_tapping_process(keyrecord_t record);
 #endif