[Keyboard] Add Buzzard support (#15493)

* add buzzerd

(untested, WIP)

* configured linear actuator and fixed keymap

* configuration tweaks and added custom keymap

* add custom tapping term for home row mod

* added readme

* remove ionide folder

* added scroll function to trackpoint

* keymap reworked

* using one shot shift and removed dynamic macros

* reworked default keymap

* adapted to latest qmk changes

* remove caps word from default keymap

* use provided coding guidelines

* use get_highest_layer in favour  of biton32

* fixed formatting

* remove unnecessary define statement

keyboards/buzzard/buzzard.h

@@ -0,0 +1,9 @@
+// Copyright 2021 Christoph Rehmann (crehmann)
+// SPDX-License-Identifier: GPL-2.0-or-later
+#pragma once
+
+#include "quantum.h"
+
+#if defined(KEYBOARD_buzzard_rev1)
+#   include "rev1.h"
+#endif