add ttys0's planck and preonic keymaps (#10560)

* resynced with upstream, and adjusted keymap layout for planck

* updated keyboard layout

Signed-off-by: Sean Johnson <sean@ttys0.net>

* swapped out bspc for del on symb layer

Signed-off-by: Sean Johnson <sean@ttys0.net>

* fixed typo with brightness media keys

* turns out my brightness config was correct, it was macOS that had gone sideways

* updated to bring in line with requirements for merging into upstream

* removed redundant config from rules.mk

moved media controls to FUNC layer for Planck layout

* added GPL2+ compatible license header

Signed-off-by: Sean Johnson <sean@skj.dev>

* removed unused MIDI comment

Signed-off-by: Sean Johnson <sean@skj.dev>

* removed extraneous MIDI comments

* removed extraneous comments

keyboards/planck/keymaps/ttys0/config.h

@@ -0,0 +1,24 @@
+/* Copyright 2021 Sean Johnson
+  *
+  * 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
+
+#ifdef AUDIO_ENABLE
+    #define STARTUP_SONG SONG(COLEMAK_SOUND)
+#endif
+
+// Most tactile encoders have detents every 4 stages
+#define ENCODER_RESOLUTION 4