[Keyboard] Sol keyboard conversion to split common (#5773)

* Split common conversion

* Updated serial and encoder pins

* Fixing default folder until r2

* Fixing oled driver on slave split common

* Fixing keymap compile errors

* Fixing oled inactivity timer on slave split common

* Hoisted oled driver task, init, & activity to keyboard.c

* Update keyboards/sol/config.h

Co-Authored-By: XScorpion2 <[email protected]>

* Remove TAPPING_FORCE_HOLD

quantum/split_common/matrix.c

@@ -299,7 +299,7 @@ uint8_t _matrix_scan(void) {
 
   debounce(raw_matrix, matrix + thisHand, ROWS_PER_HAND, changed);
 
-  return 1;
+  return (uint8_t)changed;
 }
 
 uint8_t matrix_scan(void) {