[Keyboard] Pinky refactor (#11643)

* QMK Configurator layout support for Pinky

3-row and 4-row versions

* refactor default keymaps

- use an enum for layer names
- remove redundant definitions
- qmk cformat pass
- modify pinky/4 via keymap to mirror pinky/4 default functionality

* remove LAYOUT_kc macros

This usage is not endorsed by QMK as it has been found to be confusing to novice users.

* add VIA support to pinky/3

* update config.h files

Removes unnecessary definitions for Backlight, RGB Underglow, Magic config and MIDI.

* update main rules.mk file

Updates the rules.mk file to match the formatting of the current QMK-provided template. Removes sample bootloader comments, feature rules that are no longer included in the template, and updates the in-line comments.

* update and split keyboard readme

Updates the main readme file's formatting, adds instructions to access bootloader mode, and adds more specific readmes for each version.

* add line breaks between rows in the info.json files

* rename layout macros for Community Layout forward compatibility

The layouts of the Pinky3 and Pinky4 aren't currently Community Layouts, but support for them could be added with a rules.mk edit should the layouts be added to QMK.

keyboards/pinky/3/keymaps/via/config.h

@@ -0,0 +1,31 @@
+/* Copyright 2018 'Masayuki Sunahara'
+ *
+ * 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
+
+//#define USE_MATRIX_I2C
+
+/* Select hand configuration */
+
+#define MASTER_LEFT
+// #define MASTER_RIGHT
+// #define EE_HANDS
+
+#define USE_SERIAL_PD2
+
+#define TAPPING_FORCE_HOLD
+#define TAPPING_TERM 200
+#define RETRO_TAPPPING