[Core] Change OLED task function to be boolean (#14864)

* [Core] Add kb level callbacks to OLED driver

* Update keyboards and keymaps

* Update docs

* Update userspace configs

* Add fix for my keymap ...

* update lefty

keyboards/rgbkb/pan/keymaps/default/keymap.c

@@ -71,7 +71,7 @@ const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
 };
 
 #ifdef OLED_ENABLE
-void oled_task_user(void) {
+bool oled_task_user(void) {
     // Host Keyboard Layer Status
     oled_write_P(PSTR("RGBKB Pan\n"), false);
     oled_write_P(PSTR("Layer: "), false);
@@ -97,6 +97,8 @@ void oled_task_user(void) {
     led_t led_state = host_keyboard_led_state();
     oled_write_P(led_state.num_lock ? PSTR("Numlock On\n") : PSTR("           \n"), false);
     oled_write_P(led_state.caps_lock ? PSTR("Capslock On \n") : PSTR("           \n"), false);
+
+    return false;
 }
 #endif