This patch should probably fix Wacom Airbrush devices

This patch adds recognition of the device type on Linux, and tries to
fix the tangential pressure parameter.

If you happen to have an Airbrush device, please do test whether
tangential pressure starts working correctly.

Most probable bug: the range of the tangential pressure might be
wrong, since I don't know in which limits it is linked in the driver.
If you see any problems with it, please generate an event log file
for moving the button in all directions slowly. Here is a manual how
to do that:

https://answers.launchpad.net/krita-ru/+faq/2495

Thanks arturg for providing initial patches!

CCBUG:343545
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