tests: add python parser for hwdb grammar

tests: add python parser for hwdb grammar

This works for hwdb/[67]0-*.hwdb. I also added code to parse hwdb/20-*, but those
files are huge, and parsing them using this parser is annoyingly slow (about one
minute for the biggest files). So I removed the support for hwdb/20-*, a much simpler
hand-generated parser should suffice for those.

Current output:

hwdb/60-evdev.hwdb: 24 match groups, 35 matches, 88 properties, 0.19323015213012695s to parse
Match 'evdev:input:b0003v05ACp0259*' is duplicated
Match 'evdev:input:b0003v05ACp025A*' is duplicated
Match 'evdev:input:b0003v05ACp025B*' is duplicated
hwdb/60-keyboard.hwdb: 122 match groups, 188 matches, 638 properties, 1.0906572341918945s to parse
Failed to parse: 'KEYBOARD_KEY_8F=switchvideomode'
Failed to parse: 'KEYBOARD_KEY_C0183=media'
Failed to parse: 'KEYBOARD_KEY_C0201=new'
Failed to parse: 'KEYBOARD_KEY_C0289=reply'
Failed to parse: 'KEYBOARD_KEY_C028B=forwardmail'
Failed to parse: 'KEYBOARD_KEY_C028C=send'
Failed to parse: 'KEYBOARD_KEY_C021A=undo'
Failed to parse: 'KEYBOARD_KEY_C0279=redo'
Failed to parse: 'KEYBOARD_KEY_C0208=print'
Failed to parse: 'KEYBOARD_KEY_C0207=save'
Failed to parse: 'KEYBOARD_KEY_C0194=file'
Failed to parse: 'KEYBOARD_KEY_C01A7=documents'
Failed to parse: 'KEYBOARD_KEY_C01B6=images'
Failed to parse: 'KEYBOARD_KEY_C01B7=sound'
Property KEYBOARD_KEY_c7 is duplicated
Failed to parse: 'KEYBOARD_KEY_cF=end'
hwdb/70-mouse.hwdb: 62 match groups, 93 matches, 68 properties, 0.34186625480651855s to parse
Match 'mouse:usb:v046dpc51b:name:Logitech USB Receiver:' is duplicated
hwdb/70-pointingstick.hwdb: 5 match groups, 14 matches, 7 properties, 0.06518816947937012s to parse
hwdb/70-touchpad.hwdb: 3 match groups, 5 matches, 3 properties, 0.039690494537353516s to parse

Subsequest commits will clean those issues up.