Keyboard: Add Big Series 2-, 3-, and 4-key boards (#3669)

* Implement magic 8-ball mode for big series switch

* LED Testing

* Add Ctrl+Alt+Del key mapping

* Add Windows lock (win+L) layout.

* Add Big Series 3-key

* Add Big Series 4-key

* Add Big Series 2-key

* Fix layout mapping for Big Series 3u

* Fix merge-conflict.

* Refactor bigseries boards into a single folder

keyboards/bigseries/3key/3key.c

@@ -0,0 +1,26 @@
+/*
+Copyright 2018 Cole Markham
+
+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 "3key.h"
+
+void matrix_scan_kb(void) {
+  // Looping keyboard code goes here
+  // This runs every cycle (a lot)
+  matrix_scan_user();
+#ifdef BACKLIGHT_ENABLE
+  backlight_task();
+#endif
+};