[Keymap] ericgebhart keymap and userspace updates (#15727)

Co-authored-by: Drashna Jaelre <[email protected]>
Co-authored-by: Dasky <[email protected]>
Co-authored-by: Drashna Jael're <[email protected]>

users/ericgebhart/oled_stuff.h

@@ -0,0 +1,24 @@
+#pragma once
+/*
+  Copyright 2018 Eric Gebhart <[email protected]>
+
+  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/>.
+*/
+
+#include "quantum.h"
+#include "oled_driver.h"
+
+void oled_render_mod_lock_status(void);
+void oled_driver_render_logo(void);
+bool process_record_user_oled(uint16_t keycode, keyrecord_t *record);