Allow partial body scroll

[theKashey]

Remove-scroll right now completely disables scroll outside of the "lock". In the same time, scroll could occur as a result of a "focus-jump" or be driven programmatically in a different way.

Remove scroll shall allow parent container scroll if lock container is not fitting into parent container. Ie - if locks is bigger that window - scroll should be partially allowed, or it would lead to real production issues, not letting customers interact with the content they have to.

[theKashey]

on the lock activation a whole target should be in a viewport, and if not, them:

• reset user zoom, literally zoom out (change user zoom meta tag, try el.scrollToView)
• make own lock div scrollable (don't forget to test your modals for content overflow)
• don't activate the lock (and don't trap the user)

if in runtime scroll-lock detects scrolling out of the target - the mechanics listed above have to be reapplied.
The actual behaviour should be configurable by the user, however, some safety net should be active all the time to prevent really bad situations.

PS: keep in mind, zooming in should be allowed with if touchZoom is enabled

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