[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

users/mverteuil/.gitignore

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+copyright.h

users/mverteuil/mverteuil.c

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+#include QMK_KEYBOARD_H
+#include "mverteuil.h"

users/mverteuil/mverteuil.h

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+#if AUDIO_ENABLE
+#    if __has_include("copyright.h")
+#        include "copyright.h"
+#    endif
+
+#    define LOWER_SOUND S__NOTE(_EF5), W__NOTE(_REST), Q__NOTE(_E4)
+#    define NUMPAD_SOUND S__NOTE(_DF5), S__NOTE(_REST), S__NOTE(_C6)
+#    define RAISE_SOUND S__NOTE(_E4), W__NOTE(_REST), Q__NOTE(_EF5)
+
+#    define AUDIO_ON_SONG SONG(ZELDA_PUZZLE)
+#    define LAYER_FUNCROW_ON_SONG SONG(COLEMAK_SOUND)
+#    define LAYER_FUNCROW_OFF_SONG SONG(QWERTY_SOUND)
+#    define LAYER_NMPAD_SONG SONG(NUMPAD_SOUND)
+#    define LAYER_LOWER_SONG SONG(LOWER_SOUND)
+#    define LAYER_RAISE_SONG SONG(RAISE_SOUND)
+#else
+//   No-op version of PLAY_SONG instead of many checks for AUDIO_ENABLED
+#    ifndef PLAY_SONG
+#        define PLAY_SONG(ARG)  // ARG
+#    endif
+#endif

users/mverteuil/rules.mk

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+SRC += mverteuil.c