Flehrad Tradestation Refactor (#13897)

* add license headers

Apache 2.0 per the included `license` file.

* info.json: use human-friendly formatting

* refactor keymaps

- split `default` keymap into `default` and `tradestation` keymaps (one for each layout)
- remove boilerplate functions
- apply four-space indent

* partial clean up of rules.mk

- update section header comment blocks

keyboards/flehrad/tradestation/tradestation.c

@@ -1 +1,16 @@
+/* Copyright 2019 flehrad
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
 #include "tradestation.h"