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.
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