Added property labelEscape in Checkbox component, allowing to use HTML labels

[debba]

I added the property labelEscape in the Checkbox component. As in the Tooltip component by default the label contents are rendered as text. Setting to false it's possible to support html tags in the label content.

I found it's very useful in some cases.

For example: Use checkbox to agree the Privacy policy, providing the privacy policy link directly inside the label.

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