Add personal userspace, update keymaps (#4845)

* Add kbd6x:konstantin keymap

* Prevent tap dance from sending LShift as a weak mod in KBD6X

* Move config.h and rules.mk definitions into userspace

* Add UC_WIN to UNICODE_SELECTED_MODES

* Temporarily use Bootmagic until Command is fixed

* Move common behavior from keyboards into userspace

* Update kbd6x:konstantin keymap and userspace

* Make a RCTRL layer in kbd6x:konstantin

* Make KC_ESC turn off layers

* KC_ESC turns L_FN off only if it was locked on

* Add missing record->event.pressed checks

* Move numpad toggling logic into function

* Disable Bootmagic, enable KEYBOARD_SHARED_EP with Command

users/konstantin/tap_dance.h

@@ -0,0 +1,25 @@
+#pragma once
+
+#include "quantum.h"
+
+#define DESKTOP TD(TD_DESKTOP)
+#define DSKTP_L LCTL(LGUI(KC_LEFT))
+#define DSKTP_R LCTL(LGUI(KC_RGHT))
+
+#define RAL_LAL TD(TD_RAL_LAL)
+#define RAL_RGU TD(TD_RAL_RGU)
+#define RCT_RSF TD(TD_RCT_RSF)
+
+#define FN_RCTL TD(TD_FN_RCTL)
+#define LSFT_FN TD(TD_LSFT_FN)
+
+enum tap_dance {
+  TD_DESKTOP,
+
+  TD_RAL_LAL,
+  TD_RAL_RGU,
+  TD_RCT_RSF,
+
+  TD_FN_RCTL,
+  TD_LSFT_FN,
+};