[User] Xulkal Keymaps Update (#6392)

* Xulkal changes

Refactor rgb & encoder menu

Hadron Keymap

Refactor oled menu

* Fixing horizontal OLED data display

* Reverting changes to take to separate prs

users/xulkal/custom_rgb.h

@@ -0,0 +1,14 @@
+#pragma once
+
+#if defined(RGB_MATRIX_ENABLE)
+#include "rgb_matrix.h"
+#elif defined(RGBLIGHT_ENABLE)
+#include "rgblight.h"
+#endif
+
+#ifdef RGB_MATRIX_ENABLE
+void rgb_matrix_increase_flags(void);
+void rgb_matrix_decrease_flags(void);
+#endif
+
+void rgb_reset(void);