Add configuration to disable removing raised hand on dominant speaker change

[dimitardelchev93]

When there are participants in a conference and some of them raise hand, it is sometimes convenient to see their raised hands even after the dominant speaker changes.

Proposal:

Create a new configuration setting disableRemoveRaisedHandOnFocus, which is false by default. If set to true, it will disable the removal of raised hand when the dominant speaker changes.

How it works now - when participant with raised hand becomes dominant speaker, his raised hand indicator is removed:

How it will work, if disableRemoveRaisedHandOnFocus is set to true - when participant with raised hand becomes dominant speaker, his raised hand indicator is not removed:

[stale]

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