CATROID-921 Disable Hints dialog

[Veve8010]

Implement a dialog that asks the user if they want to enable or disable hints. The dialog is shown only once, right before the first hint would be shown and will not be shown again if the user changes the hint settings afterwards.
https://jira.catrob.at/browse/CATROID-921

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[Veve8010]

3 failing tests on jenkins (only "testEmptyTrustList.kt" fails also locally)

[wslany]

Thanks!