mouse button code in INFO environment varaible (#356)

[fuyu0425]

as discussed in #356.

[FelixKratz]

I have changed the $INFO to a JSON that contains the full click info, including the modifier key codes (these can be used for detecting multiple modifiers pressed at the same time):

{
	"button": "right",
	"button_code": 1,
	"modifier": "alt",
	"modfier_code": 524320
}

You will get the "button_code" with jq:

echo "$INFO" | jq -r ".button_code"