converter/ibm_terminal Refactor and Configurator support (#4414)

* IBM Terminal converter: layout macro refactor

- Renamed KEYMAP to LAYOUT
- Renamed KEYMAP_101 to LAYOUT_101
- minor matrix array fixes

* IBM Terminal converter: default keymap refactor

- Updated layout macro names
- Updated to #include QMK_KEYBOARD_H
- config.h updated to use #pragma once

* IBM Terminal converter: priyadi keymap refactor

- Updated layout macro names
- Updated to #include QMK_KEYBOARD_H
- Removed redundant KC_TRNS and KC_NO defines
- config.h updated to use #pragma once

* IBM Terminal converter: Configurator support

* IBM Terminal converter: readme cleanup

Updated markdown formatting.

* IBM Terminal converter: readme rename

Renamed file to fully lowercase.

keyboards/converter/ibm_terminal/readme.md

@@ -0,0 +1,39 @@
+# 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 section 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/
+