PeekChannelContent and initial algorithm support, DevSubmit support, Prevent crash url search before init, Documentation url scanning for devportal, limit ongoing downloads ui to 4

Added scroll to top. Full scrollable parent comment and Polycentric process secret backup and automatic database recovery.

Gesture controls can individually be enabled/disabled and can be toggled to use system or non-system values.

Fixed buttons in subscription groups and made select button click only work when there are things selected.

Fixed duration format. Added tutorial fragment. Added dialog that asks you if you want to see the tutorials on the first app boot. Made casting when clicking start now open connected dialog. Fixed crashes related to sliders in casting connected control. Fixed history tab title. Removed old FCast encryption.

Implemented delete comment support. Implemented Comments tab. Implemented replies overlay showing parent comment.