[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/tau4/keymaps/default/keymap.c

@@ -113,7 +113,7 @@ bool encoder_update_user(uint8_t index, bool clockwise) {
 }
 
 
-#ifdef OLED_DRIVER_ENABLE
+#ifdef OLED_ENABLE
 
 static void render_status(void) {
     oled_write_P(PSTR("Tau.4 v1.0\n\n"), false);

keyboards/tau4/rules.mk

@@ -21,7 +21,8 @@ RGBLIGHT_ENABLE = yes       # Enable keyboard RGB underglow
 BLUETOOTH_ENABLE = no       # Enable Bluetooth
 AUDIO_ENABLE = no           # Audio output
 ENCODER_ENABLE = yes        # Rotary Encoder support
-OLED_DRIVER_ENABLE = yes    # OLED display support
+OLED_ENABLE = yes
+OLED_DRIVER = SSD1306    # OLED display support
 # EEPROM_DRIVER ?= i2c        # Driver for external EEPROM chip
 # This is currently not working due to QMK not officially supporting the chip used on the Tau4, I am working on a fix.