Enhancement/add touch to sliders

[MihailTodorov]

• Self-reviewed and fixed any obvious mistakes, TODOs, removed debugging code, logs, etc
• Updated package.json in related components, the library or the cli
• Created tests
• Tested in a browser
• Tested in Gameface
• Created or updated the documentation
• Transferred or updated the Hugo documentation and example

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[alien1976]

Can't we directly check if the classList contains 'handle-1' and omit the rest checks?Why do we want to check for the horizontal or vertical rangeslider handle? Is it possible another element to have the class 'handle-1'?

Also as we have the refs to the handles, can't we simply check by ref the target?
For example:

if(e.target === this.handle[0]) this.activeHandle = 0;
else if(e.target === this.handle[1]) this.activeHandle = 1;
else this.activeHandle = this.getClosestHandleToMousePosition(percent);