[Keyboard] Add Orbit keyboard (#5306)

* Get things working except indicators

* Attempt to get things working

* hmm

* Compiles but doesn't run

* Make data transfer work

* Get all indicators working

* Remove old transport

* Prepare for pullreq

* Revert keymap from testing to production

* Final error checking for pull request

* Remove autogenerated is_command from config.h

* Rewrite pin toggles using qmk functions

keyboards/ai03/orbit/split_util.c

@@ -0,0 +1,87 @@
+#include "split_util.h"
+#include "matrix.h"
+#include "keyboard.h"
+#include "config.h"
+#include "timer.h"
+#include "split_flags.h"
+#include "transport.h"
+#include "quantum.h"
+
+#ifdef EE_HANDS
+#   include "tmk_core/common/eeprom.h"
+#   include "eeconfig.h"
+#endif
+
+volatile bool isLeftHand = true;
+
+__attribute__((weak))
+bool is_keyboard_left(void) {
+  #ifdef SPLIT_HAND_PIN
+    // Test pin SPLIT_HAND_PIN for High/Low, if low it's right hand
+    setPinInput(SPLIT_HAND_PIN);
+    return readPin(SPLIT_HAND_PIN);
+  #else
+    #ifdef EE_HANDS
+      return eeprom_read_byte(EECONFIG_HANDEDNESS);
+    #else
+      #ifdef MASTER_RIGHT
+        return !is_keyboard_master();
+      #else
+        return is_keyboard_master();
+      #endif
+    #endif
+  #endif
+}
+
+bool is_keyboard_master(void)
+{
+#ifdef __AVR__
+  static enum { UNKNOWN, MASTER, SLAVE } usbstate = UNKNOWN;
+
+  // only check once, as this is called often
+  if (usbstate == UNKNOWN)
+  {
+    USBCON |= (1 << OTGPADE);  // enables VBUS pad
+    wait_us(5);
+
+    usbstate = (USBSTA & (1 << VBUS)) ? MASTER : SLAVE;  // checks state of VBUS
+  }
+
+  return (usbstate == MASTER);
+#else
+  return true;
+#endif
+}
+
+static void keyboard_master_setup(void) {
+#if defined(USE_I2C) || defined(EH)
+  #ifdef SSD1306OLED
+    matrix_master_OLED_init ();
+  #endif
+#endif
+  transport_master_init();
+
+  // For master the Backlight info needs to be sent on startup
+  // Otherwise the salve won't start with the proper info until an update
+  BACKLIT_DIRTY = true;
+}
+
+static void keyboard_slave_setup(void)
+{
+  transport_slave_init();
+}
+
+// this code runs before the usb and keyboard is initialized
+void matrix_setup(void)
+{
+  isLeftHand = is_keyboard_left();
+
+  if (is_keyboard_master())
+  {
+    keyboard_master_setup();
+  }
+  else
+  {
+    keyboard_slave_setup();
+  }
+}