implement interrupt read for palm connection info

[Lana-chan]

This allows hotsyncing with the Treo 90 (and possibly other oddball Palm OS 4.1 PDAs), which informs the USB endpoints for hotsyncing differently.

See also: #13

[desrod]

Can you provide a bit more detail on exactly what you're addressing with this PR? My Treo 650 died years ago and I can't find parts or a replacement, so I can't confirm this change.

Thanks!

[Lana-chan]

pilot-link is getting updates again! thank you so much for your work!!

I submitted this 3 years ago and haven't really used my PDAs much since then, but I tried to document some of my findings in #13: I saw in a USB capture the header for hotsync communication showing up in an URB_INTERRUPT packet, which I assumed was a newer, or at least different, way the PDA would signal to HotSync Manager that a sync was requested (for example when pushing the hotsync button on the cable). This type of packet (which has the same contents as the control request packets) wasn't handled in pilot-link, so that's what I tried to address here.

I can confirm this made my Treo 90 work, and didn't seem to impede syncing with any of my other PDAs that already worked (such as the older Visors)