(enh) stop passing MSC scancodes and extra SYN events #99
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Changes
As described. We try to send non-key events unfiltered, but this also includes MSC scancode events (which make no sense once we remap) and a ton of extra SYN events for other events we've probably filtered anyways.
This drops the MSC events on the floor and only allows SYN to pass thru in cases where it seems to be needed (ie, we've recently passed thru other raw data).
Checklist