[Keymap] Add userspace and personal keymaps (#7093)

* Add Planck keymap and custom keycodes to userspace

* Add Preonic keymap and extract common ortho layers and keycodes

* Add Leaf60 WKL keymap

* Add M60-A keymap

* Add Levinson keymap

* Fix links in personal readmes

* Use flash target

* Remove duplicate definition

Co-Authored-By: fauxpark <fauxpark@gmail.com>

* Remove superfluous line endings

* Planck and preonic encoder should have the same behavior

* Use higher level API

Co-Authored-By: fauxpark <fauxpark@gmail.com>

* Use layouts to reduce planck/levinson duplication

* Update flash instructions for levinson

keyboards/foxlab/leaf60/universal/keymaps/mguterl/config.h

@@ -0,0 +1,19 @@
+/* Copyright 2019 Fox Lab
+ *
+ * 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
+
+// place overrides here