Generate Short Labels for Keys with Behaviors that don't have HID Code set as first Param

[aziddy]

The un-hovered boxes showing nothing bothers me alot. This method isn't ideal either, but it shows that something is atleast populated on the key

1. Still Checks for label from hid_usage prop and renders the same as before this PR
2. If no label exists (either HID Code not in hid-usage-name-overrides.json or just not a HID Code) it will start using the behavior name provided by the added behavior_name prop to generate a short label
3. First use "_" & "-" as delimiters between sections, grabs first letter between sections upto 3
4. If "_" & "-" are not present, uses first 3 letters of behavior name instead

Works with custom behaviors too (pictured)

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[atever]

Thanks a lot, this is exactly what I need! Maybe we could display a blank for the following two cases:

1. When the content is _Trans (shows as T, same as the letter T);
2. When the content is unknown (shows as UNK).