Feature/touchslider (#8119)

* Added Touch Slider scene & script (initial commit)

* added null check

* Refined math for touching collider bounds

* updated description text

* fixed resize / reposition bug

* adjusted background panel height

* added tooltips / summaries / comments

* Touch slider polish

* Update Assets/MRTK/SDK/Experimental/TouchSlider/TouchSlider.cs

Co-authored-by: Julia Schwarz <[email protected]>

* Update Assets/MRTK/SDK/Experimental/TouchSlider/TouchSlider.cs

Co-authored-by: Julia Schwarz <[email protected]>

* Update script to match coding guidelines

* Formatting

* Add range for snapValue

Co-authored-by: Yoon Park <[email protected]>
Co-authored-by: Julia Schwarz <[email protected]>
Co-authored-by: Kurtis Eveleigh <[email protected]>

Author: 4 people

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