actuation point adjustment for fc980c and fc660c (#2134)

* add i2c lib submodule

* add actuation point adjustment to fc980c

* add actuation point adjustment to fc660c also.

* use https for i2c submodule

* move to existing i2c lib

* properly remove old submodule

* oops, forgot some files for the fc660c

keyboards/fc980c/keymaps/actuation-point-example/config.h

@@ -0,0 +1,32 @@
+/* Copyright 2017 Balz Guenat
+ *
+ * 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/>.
+ */
+
+#ifndef CONFIG_USER_H
+#define CONFIG_USER_H
+
+#include "config_common.h"
+
+// place overrides here
+
+// higher value means deeper actuation point, less sensitive
+// be careful and only make small adjustments (steps of 1 or 2).
+// too high and keys will fail to actuate. too low and keys will actuate spontaneously.
+// test all keys before further adjustment.
+// this should probably stay in the range +/-5.
+#undef ACTUATION_DEPTH_ADJUSTMENT
+#define ACTUATION_DEPTH_ADJUSTMENT +1
+
+#endif