restructure converters (#1825)

* restructure converters

each converter is its own keyboard and different hardware variants are different subprojects.

remove (seemingly) old method of loading layouts from main Makefile

* call led_set_kb() from overridden led_set()

* put converter back into one folder

* revert some structure changes to bring in line with #1784.

Also attempt to get the BLE thing more properly integrated.
Also also fix led_set() to call led_set_kb().

keyboards/converter/ibm_terminal/README.md

@@ -0,0 +1,40 @@
+Keyboard converter for IBM terminal keyboard
+============================================
+
+This is a port of TMK's converter/terminal_usb to QMK.
+
+It supports PS/2 Scan Code Set 3 and runs on USB AVR chips such like PJRC Teensy.
+I tested the converter on ATMega32U4 with 1392595(102keys) and 6110345(122keys).
+
+Source code: https://github.com/qmk/qmk_firmware.git
+Article: http://geekhack.org/index.php?topic=27272.0
+
+
+CONNECTION
+----------
+Keyboard    ATMega32U4
+----------------------
+Data:       PD2
+Clock:      PD5
+
+And VCC and GND, of course. See RESOURCE for keyboard connector pin assign.
+
+
+BUILD
+-----
+$ git clone https://github.com/qmk/qmk_firmware.git
+$ cd qmk_firmware
+$ make converter/ibm_terminal:default
+
+
+RESOURCE
+--------
+Soarer's Converter: http://geekhack.org/index.php?topic=17458.0
+102keys(1392595): http://geekhack.org/index.php?topic=10737.0
+122keys(1390876): http://www.seasip.info/VintagePC/ibm_1390876.html
+KbdBabel: http://www.kbdbabel.org/
+RJ45 Connector: http://www.kbdbabel.org/conn/kbd_connector_ibmterm.png
+DIN Connector: http://www.kbdbabel.org/conn/kbd_connector_ibm3179_318x_319x.png
+WinAVR: http://winavr.sourceforge.net/
+
+EOF