Debounce refactor / API (#3720)

* Added xeal60 via clone of lets split

* Delete removed other keymaps

* Basic keymap (no FN). Compiles.

* Removed NP_STAR and NP_SLSH.

* Removed "debounce_algo = manual" in all keyboards with CUSTOM_MATRIX = yes.

* Changed order of rules in TMK. Documented feature.

* Fixed missing whitespace in debounce documentation

Table wasn't working due to missing newline.

* Added bold in a few areas.

* DO NOT USE - Removed debounce from TMK.

* Remove accidental xeal60 commit

* DO NOT USE - debounce successfully compiled.

* DO NOT USE Revert back to original API to support split_keyboards.

* Working eager_pk

* Whitespace cleanup.

* Restored debounce.h since there wasnt any real change.

* Moved debouncing_time variable  to inside #if debounce

* Removed check for custom_matrix. We can safely include the debounce file for compilation when custom_matrix is used.

* Removed #include "matrix.h" from debounce.h

* Bug fix - was using MATRIX_ROWS instead of num_rows

* Fixed compilation error with debounce_sym_g

* Renamed DEBOUNCE_ALGO to DEBOUNCE_TYPE

* Malloc array in debounce_eager_pk, since split keyboards only use MATRIX_ROWS/2.

* Fix compile error in debounce_eager_pk

* Stricter, leaner DEBOUNCE_TYPE section in common_features.mk. Cleanup debounce_type.mk

diff --cc common_features.mk
Simple merge

diff --cc quantum/matrix.c
Simple merge

diff --cc tmk_core/common/keyboard.c
Simple merge