[Keymap] Add jonavin user space / common functions (#13876)

Co-authored-by: Drashna Jaelre <drashna@live.com>
Co-authored-by: Ryan <fauxpark@gmail.com>
Co-authored-by: Jonavin <=>

users/jonavin/readme.md

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+Copyright 2021 Jonavin Eng @Jonavin
+
+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/>.
+
+LAYERS:
+    0 = _BASE
+    1 = _FN1
+    2 = _LOWER
+    3 = _RAISE
+
+KEYCODES:
+    KC_CAD          Ctrl-Alt-Del	  
+    KC_AF4	        Alt-F4
+    KC_TASK	        Windows Task Manager (Ctrl-Shift-Esc) 
+    LSFT_CAPSLOCK   When LSFT_CAPSLOCK_ENABLE is defined, hold for Shift double tap for CAPSLOCK; otherwise, just Shift
+    KC_00           double zero "00"
+    KC_WINLCK       toggles LGui/Win key lock
+    RGB_TOI         Increase Timeout idle time threshold
+    RGB_TOD         Decrease Timeout idle time threshold
+
+ENABLE FEATURES your keymap rules.mk
+
+STARTUP_NUMLOCK_ON = yes
+    turns on NUMLOCK by default
+
+ENCODER_DEFAULTACTIONS_ENABLE = yes
+    Enabled default encoder funtions
+    When enabled, use this in the keymap for an additional encoder processing 
+        bool encoder_update_keymap(uint8_t index, bool clockwise)
+  
+    OPTION: set ENCODER_DEFAULTACTIONS_INDEX to the encoder number if the encoder is not index 0
+  
+TD_LSFT_CAPSLOCK_ENABLE = yes
+    This will enable double tap on Left Shift to toggle CAPSLOCK
+        KC_LSFTCAPS to bind to left Shift to enable feature
+        KC_LSFTCAPSWIN does the same thing but will not turn on CAPS when Win Lkey is disabled
+
+IDLE_TIMEOUT_ENABLE = yes
+    Enables Timer functionality; for RGB idle timeouts that can be changed dynamically
+    When enabled, use this in the keymap for an additional matrix processing     
+        void matrix_scan_keymap(void)
+    
+    Functions:
+        u16int_t get_timeout_threshold(void)            // returns the current timeout threshold
+        void timeout_update_threshold(bool increase)    // change threshold: true = increase, false = decrease     
+        void timeout_reset_timer(void)                  // resets timer (put in process_record_user if you override it)
+        void timeout_tick_timer(void)                   // registers time ticks (put in maxtrix_scan_user if you override it)
+
+Other Functions:
+    - activate_numlock(bool turn_on)                    // true = turn on NUM LOCK, false = off 
+
+KEYMAP LEVEL ADDITIONAL PROCESSING FUNCTIONS
+    bool process_record_keymap(uint16_t keycode, keyrecord_t *record)
+    void keyboard_post_init_keymap(void)
+
+LIST OF COMPATIBLE KEYMAPS
+    - gmmk/pro
+    - gmmk/pro/ansi
+    - keebio/quefrency/rev3
+    - mechwild/mercutio
+    - mechwild/murphpad (*)
+    - mechwild/OBE (*)
+    - nopunin10did/kastenwagen (*)
+
+    (*) coming soon