[Keyboard] support tkl_iso community layout (#6778)

* support tkl_iso community layout

* fix comments from review

* fix review comments

* LAYOUT is an alias for LAYOUT_all
* add keymap default_iso
* revert changes to default keymap

keyboards/bpiphany/unloved_bastard/keymaps/default_iso/config.h

@@ -0,0 +1,24 @@
+/* Copyright 2018 Alexander Fougner <fougner89 at 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/>.
+ */
+
+#ifndef CONFIG_USER_H
+#define CONFIG_USER_H
+
+#include "config_common.h"
+
+// place overrides here
+
+#endif