Add Sinc Rev. 3 (#18846)

* Initial work on adding Sinc Rev. 3

* Add RGB Matrix support

* Add encoder map support

* Set I2C pins

* Update LED locations for right half

* Move USB definitions to info.json

* Update RGB modes

* Replace pin mappings for right half with correct ones

* Move config.h back to rev1/rev2 due to addition of rev3

* Convert initial Rev. 3 config work to be data-driven

* Convert RGB Matrix config to DD format

* More config cleanup

* Use full-duplex PIO

* Add MCU/bootloader settings for Rev. 2

* Change ISO Enter location since it shares location with Backslash

* Adjust build settings to reduce flash/EEPROM usage

keyboards/keebio/sinc/rev1/config.h

@@ -0,0 +1,34 @@
+/* Copyright 2021 Danny Nguyen <danny@keeb.io>
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 2 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#pragma once
+
+// wiring of each half
+#define SPLIT_HAND_PIN F7
+
+/* Mechanical locking support. Use KC_LCAP, KC_LNUM or KC_LSCR instead in keymap */
+#define LOCKING_SUPPORT_ENABLE
+/* Locking resynchronize hack */
+#define LOCKING_RESYNC_ENABLE
+
+/* ws2812 RGB LED */
+#define RGBLIGHT_LED_MAP { 1, 2, 3, 12, 13, 14, 15, 0, 7, 6, 5, 4, 11, 10, 9, 8 }
+#define RGBLIGHT_DEFAULT_MODE (RGBLIGHT_MODE_RAINBOW_SWIRL + 2)
+
+// Set right column, left macro, 1.75u shift, split spaces, and 5x1u on by default
+#define VIA_EEPROM_LAYOUT_OPTIONS_DEFAULT 0x00DE
+#define VIA_EEPROM_LAYOUT_OPTIONS_SIZE 2
+#define DYNAMIC_KEYMAP_LAYER_COUNT 3