Fixes #17297.  Changed relative mouse position to absolute, and added automated RangeSlider tests.

(cherry picked from commit f21df6fbd6063ca4295d8932d12ffa463a36a365)

Conflicts:
	form/_RangeSliderMixin.js
	form/tests/test_RangeSlider.html
Backport fix of polish translation. ref #17857.
Backport fix for https://bugs.dojotoolkit.org/ticket/15561
 from 1.10 commit: https://github.com/dojo/dojox/commit/f4a8237b8301c0db7b49a316161f5bcbbfcdb39c
fix js doc parse issues, refs #18002

(cherry picked from commit 87ac7b3c5c2034d6e3c0baa17dcc14d459f1a5b2)
Fixes #17822. Fix more failing cases when onFlickAnimationStart/End() are not properly triggered
(cherry picked from commit ab5ea219374e503a2d384940d6518a7f061aac17)