[Keymap] Add userspace rverst (#12205)

Co-authored-by: Robert Verst <robert.verst@tobit.com>

users/rverst/rverst.h

@@ -0,0 +1,81 @@
+/* Copyright 2021 Robert Verst <robert@verst.eu> @rverst
+ *
+ * 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
+
+#include QMK_KEYBOARD_H
+
+enum userspace_mode {
+    MAC = 0,
+    WINDOWS,
+    MAC_UNI,
+    WINDOWS_UNI,
+    LINUX_UNI,
+};
+
+enum userspace_keycodes {
+    RV_NON = SAFE_RANGE,
+    RV_SM0,   // set Mac Unicode mode
+    RV_SM1,   // set Window Unicode mode
+    RV_SM2,   // set Linux Unicode mode
+    RV_SM3,   // set Mac lagecy mode
+    RV_SM4,   // set Windows legacy mode
+    RV_SM0S,  // set Mac Unicode mode and save
+    RV_SM1S,  // set Windows Unicode mode and save
+    RV_SM2S,  // set Linux Unicode and save
+    RV_SM3S,  // set Mac legacy mode
+    RV_SM4S,  // set Windows legacy and save
+    RV_SAYM,  // say mode
+    RV_LOCK,  // lock computer
+    RV_AUML,  // äÄ
+    RV_OUML,  // öÖ
+    RV_UUML,  // üÜ
+    RV_EUR,   // €
+    RV_SZ,    // ߧ
+    RV_TM,    // ™
+    RV_RT,    // ®
+    RV_CC,    // ©
+    RV_DEG,   // °
+    RV_SNAP,  // Screenshot
+    RV_PM,    // ±
+    RV_UNEQ,  // ≠
+    RV_SUP1,  // ¹
+    RV_SUP2,  // ²
+    RV_SUP3,  // ³
+
+};
+
+typedef union {
+    uint32_t raw;
+    struct {
+        bool mode_1 : 1;
+        bool mode_2 : 1;
+        bool mode_3 : 1;
+    };
+} userspace_config_t;
+
+extern userspace_config_t userspace_config;
+
+uint8_t  get_mode(void);
+void     set_mode(uint8_t mode, bool save);
+void     switch_mode(uint8_t mode);
+bool     is_unicode(uint8_t mode);
+
+void keyboard_pre_init_keymap(void);
+void keyboard_post_init_keymap(void);
+void eeconfig_init_keymap(void);
+bool process_record_keymap(uint16_t keycode, keyrecord_t *record);
+