Keyboard update: SL40 (#10445)

* adding alpha variants

* adding cajal layouts

* adding V2 PCB support

adding additional layouts for new PCB version, and correecting incorrect image in info file

* Cleanup master -- remove alpha9

* Cleanup master -- remove g4m3ralpha

* Cleanup master -- remove cajal & sl40

* Master cleanup -- re-add sl40

* Master cleanup -- correct SL40 image

* Keyboard addenda: Production version of sl40

Co-authored-by: worldspawn00 <mcmancuso@gmail.com>

keyboards/wsk/sl40/config.h

@@ -1,3 +1,19 @@
+/* Copyright 2020 Worldspawn <mcmancuso@gmail.com>
+ *
+ * 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 "config_common.h"