[Keyboard] Add Keybage folder for RadPad (#9745)

* [Keyboard] Initial Keybage/RadPad firmware

* [Keyboard] RadPad apply pull request feedback

- Change `LAYOUT_***_Encoders` to `LAYOUT_***_encoders` in <keyboard>.h
- Remove bootloader comments and unnecessary build options from rules.mk
- Use `LTO_ENABLE`
- Remove empty config.h from default keymap
- Remove trailing ` \` from keymap

* [Keyboard] RadPad fix info.json

- Change `LAYOUT_***_Encoders` to `LAYOUT_***_encoders` in info.json

* [Keyboard] Add host LED status to OLED display

* [Keyboard] Use LAYOUT_4x4_encoders, not LAYOUT

* [Keyboard] Use LAYOUT_4x4_encoders, not LAYOUT

* [Keyboard] Remove DESCRIPTION from config.h

keyboards/keybage/radpad/radpad.h

@@ -0,0 +1,87 @@
+/* Copyright 2020 Brandon Schlack
+ *
+ * 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 "quantum.h"
+
+#define XXX KC_NO
+
+/* This is a shortcut to help you visually see your layout.
+ *
+ * The first section contains all of the arguments representing the physical
+ * layout of the board and position of the keys.
+ *
+ * The second converts the arguments into a two-dimensional array which
+ * represents the switch matrix.
+ */
+#define LAYOUT_4x4_encoders( \
+    k00,           k03, \
+    k10, k11, k12, k13, \
+    k20, k21, k22, k23, \
+    k30, k31, k32, k33, \
+    k40, k41, k42, k43  \
+) \
+{ \
+    { k00, XXX, XXX, k03 }, \
+    { k10, k11, k12, k13 }, \
+    { k20, k21, k22, k23 }, \
+    { k30, k31, k32, k33 }, \
+    { k40, k41, k42, k43 }  \
+}
+
+#define LAYOUT_4x3_encoders( \
+    k00,           k03, \
+    k10, k11, k12, k13, \
+    k20, k21, k22, k23, \
+    k30, k31, k32, k33 \
+) \
+{ \
+    { k00, XXX, XXX, k03 }, \
+    { k10, k11, k12, k13 }, \
+    { k20, k21, k22, k23 }, \
+    { k30, k31, k32, k33 }, \
+    { XXX, XXX, XXX, XXX }  \
+}
+
+#define LAYOUT_3x4_encoders( \
+    k01,      k03, \
+    k11, k12, k13, \
+    k21, k22, k23, \
+    k31, k32, k33, \
+    k41, k42, k43  \
+) \
+{ \
+    { XXX, k01, XXX, k03 }, \
+    { XXX, k11, k12, k13 }, \
+    { XXX, k21, k22, k23 }, \
+    { XXX, k31, k32, k33 }, \
+    { XXX, k41, k42, k43 }  \
+}
+
+#define LAYOUT_3x3_encoders( \
+    k01,      k03, \
+    k11, k12, k13, \
+    k21, k22, k23, \
+    k31, k32, k33  \
+) \
+{ \
+    { XXX, k01, XXX, k03 }, \
+    { XXX, k11, k12, k13 }, \
+    { XXX, k21, k22, k23 }, \
+    { XXX, k31, k32, k33 }, \
+    { XXX, XXX, XXX, XXX }  \
+}