Adds .qmk file type as a target for QMK Toolbox (#1084)

* adds .qmk file type as a target

* adds info.json with vendor and product

* add files for qmk info script

* add layout file for planck

* ignore .qmk files

* more settings

* update rules for avr and chibios

* update .qmk generation for info.json and inheritence

.gitignore

@@ -4,6 +4,7 @@
 *.eep
 *.elf
 *.hex
+*.qmk
 !util/bootloader.hex
 !quantum/tools/eeprom_reset.hex
 *.log