[Keymap] Added mverteuil keymaps and userspace common code (#7876)

* Added mverteuil content

- Userspace
- Knops keymap
- Preonic keymaps

* Simplified and replaced some magic numbers

* Convert tabs to spaces

* Clean up LED handling, better animation, better layer init

* Use get_highest_layer per @drashna suggestion

* Reorder prototypes/reformat

* Simplified/more expessive and fixed initial layer LED

* Remove changes to git ignored files

keyboards/preonic/keymaps/mverteuil/config.h

@@ -0,0 +1,39 @@
+#ifdef AUDIO_ENABLE
+#    if __has_include("copyright.h")
+#        include "copyright.h"
+#    endif
+
+#    define AUDIO_CLICKY_DELAY_DURATION 0
+#    define AUDIO_CLICKY_FREQ_DEFAULT 100.0f
+#    define AUDIO_CLICKY_FREQ_MIN 61.0f
+#    define AUDIO_CLICKY_FREQ_RANDOMNESS 0.2f
+#    define DAC_SAMPLE_MAX 7000U
+#    define STARTUP_SONG SONG(WORKMAN_SOUND)
+#    define GOODBYE_SONG SONG(COIN_SOUND)
+#endif
+
+#define MUSIC_MASK (keycode != KC_NO)
+
+/*
+ * MIDI options
+ */
+
+/* Prevent use of disabled MIDI features in the keymap */
+//#define MIDI_ENABLE_STRICT 1
+
+/* enable basic MIDI features:
+   - MIDI notes can be sent when in Music mode is on
+*/
+
+#define MIDI_BASIC
+
+/* enable advanced MIDI features:
+   - MIDI notes can be added to the keymap
+   - Octave shift and transpose
+   - Virtual sustain, portamento, and modulation wheel
+   - etc.
+*/
+//#define MIDI_ADVANCED
+
+/* override number of MIDI tone keycodes (each octave adds 12 keycodes and allocates 12 bytes) */
+//#define MIDI_TONE_KEYCODE_OCTAVES 2