Amethyst 0.40.2 (alpha): Video Upload and Playback rebuild

Lots of major and minor improvements in video support.

- Adds "Seen on Relay" information for NIP-94 and 95 posts

- Adds custom video playback controls with autoplay starting on mute

- Adds video uploading progress UI

- Adds NIP-95 in-disk caching

- Adds Zap payment confirmations without the receiver having a Zap setup

- Animates to the top after posting in the Video feed

- Keeps position in the Video feed between screen

- Fixes the Crossfade for BlurHash on NIP94 and NIP95 events

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