[Keyboard] Refactor of onekey to support multiple development boards (#6017)

* Initial refactor of onekey to support multiple development boards

* Fixes to get teensy lc && 3.2 working

* Add pin tables

* Add caveats to Teensy boards

* Correct bootloader for Elite-C

keyboards/handwired/onekey/proton_c/config.h

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+/* Copyright 2019
+ *
+ * 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
+
+#include "config_common.h"
+
+#define MATRIX_COL_PINS { A3 }
+#define MATRIX_ROW_PINS { A2 }
+#define UNUSED_PINS

keyboards/handwired/onekey/proton_c/readme.md

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+# Proton C onekey
+
+To trigger keypress, short together pins *A3* and *A2*.

keyboards/handwired/onekey/proton_c/rules.mk

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+# MCU name
+MCU = STM32F303