Add "Anti-tremor filtering" for users with Essential Tremor

Movement disorders are terrible conditions, and when matched with movement-based input devices (such as mouses, trackpads and touchpads), it results in users unable to utilize their own devices. Providing an option to correct cursor shaking would enable them to make proper use of their computer again, and it could also help users with faulty input devices.

There is no OS support from the big players, and existing 3rd party software for other Operative Systems that implement such feature are limited to [SteadyMouse](https://www.steadymouse.com) for Windows

[DwellClick](http://pilotmoon.com/dwellclick/) for Mac and other similar apps are based on Dwell-clicking, a different technique that is actually complementary to this feature.

Not every user has access to a hardware-based solution, so providing this aid is extremely important.