Add mouse distance offset

[jsbackus]

To improve sluggishness for slight movements, add a small offset to the curve calculation in JoyButton::mouseEvent. See issue #105 for more info and example code.

[pktiuk]

AntiMicro is no longer maintained. There were no bigger fixes since 2017.
There is a new recommended version of this app called AntiMicroX.

As a part of cleanup, this issue will be closed and repository will be archived.
If you find this issue relevant also for that new version of application you can create a new issue (or discussion) there (but firstly check it, because many issues of the old app are fixed and there are some new functionalities implemented)
If you will decide to create a new issue for AntiMicroX remember to mention this issue for reference.