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/rules.mk

@@ -2,17 +2,10 @@
 MCU = atmega32u4
 
 # Bootloader selection
-#   Teensy       halfkay
-#   Pro Micro    caterina
-#   Atmel DFU    atmel-dfu
-#   LUFA DFU     lufa-dfu
-#   QMK DFU      qmk-dfu
-#   ATmega32A    bootloadHID
-#   ATmega328P   USBasp
 BOOTLOADER = caterina
 
 # Build Options
-#   comment out to disable the options.
+#   change yes to no to disable
 #
 BOOTMAGIC_ENABLE = full	# Virtual DIP switch configuration(+1000)
 MOUSEKEY_ENABLE = yes	# Mouse keys(+4700)