Add support for cirque glidepoint trackpad

[xs5871]

Preview for testing.
Absolute mode (gamepad mode) works ok-ish 90% of the time but has no HID endpoint.
Relative mode (mouse mode) is unusable, likely a hardware or firmware issues with my unit.

[doesntfazer]

Any progress on this one?

[xs5871]

No progress, because no feedback. You can test it and if relative mode is working fine for you, that would be reason enough to merge.

[marcoster]

Hey there,
so I tried your code and absolute mode worked ok.
Relative mode needs some different configuration - I hacked around a bit on my fork and got it to work (but not good enough for daily driving it yet) --> see here: marcoster@a85954d

But it didn't work with the curved overlay or any flat overlay I tried.
Btw. - for most of the implementation details I took a look at qmk --> they seem to have a well working implementation for the glidepoint stuff!