Improve application of easing functions for mouse movement #425

Short overview
Users are not sure how easing functions for mouse movement work

Detailed description
The way how easing functions are currently applied is a bit confusing.
Several users asked for guidance, which is a clear sign that the implementation is not clear and examples are missing.

• Improve application of easing functions by scaling the easing function result such that it's in the same domain as the base speed
• Add a sample to the trailmix repo
• Add improvement to next release notes