- opens as a modal
- lastn is 0, mutes local video while open
- long press to talk
- and more

Update Android build to support gif
Use GIF format instead of animated webp
Show GIFs in chat messages
Display GIF over tile
Add Giphy button in reactions menu
Added Giphy dialog
Fix isGifMessage to also allow upper case

It will just flash for a split second and all it does is dispatch
readyToClose, so do it directly instead.

Converted LoadConfigOverlay to a JitsiScreen component that right now is part of navigation as ConnectingPage, plus I
separated appNative and other actions into web and native.

React Navigation v6.

* feat(security) Security Options screen

Introduce navigation for all in-conference screens.