[Core] Refactor OLED to allow easy addition of other types (#13454)

* add docs

* core changes

* update keyboards to new OLED

* updated users to new OLED

* update layouts to new OLED

* fixup docs

* drashna's suggestion

* fix up docs

* new keyboards with oled

* core split changes

* remaining keyboard files

* Fix The Helix keyboards oled options

* reflect develop

Co-authored-by: Drashna Jaelre <drashna@live.com>
Co-authored-by: mtei <2170248+mtei@users.noreply.github.com>

keyboards/rart/rartland/rartland.c

@@ -30,7 +30,7 @@ bool encoder_update_kb(uint8_t index, bool clockwise) {
 }
 #endif
 
-#ifdef OLED_DRIVER_ENABLE
+#ifdef OLED_ENABLE
 __attribute__((weak)) void oled_task_user(void) {
     // Host Keyboard Layer Status
     oled_write_P(PSTR("R A R T L A N D\nLayer: "), false);

keyboards/rart/rartland/rules.mk

@@ -24,7 +24,8 @@ RGBLIGHT_ENABLE = no        # Enable keyboard RGB underglow
 BLUETOOTH_ENABLE = no       # Enable Bluetooth
 AUDIO_ENABLE = no           # Audio output
 UNICODE_ENABLE = yes
-OLED_DRIVER_ENABLE = yes
+OLED_ENABLE = yes
+OLED_DRIVER = SSD1306
 ENCODER_ENABLE = yes
 
 LAYOUTS = 65_ansi 65_iso