Events page and streaming improvements

[roflcoopter]

• Adds filters to the Events and Timeline tabs so you can filter out only the events you want (Motion, object, ALPR etc)
• Upgrades HLS.js
• Fix calling loadSource twice when viewing 24/7 recordings, resulting in a browser console error
• Generate HLS segments directly from ffmpeg instead of writing mp4 files and manually fragmenting. This significantly improves the stream quality and removes some choppyness.
• Make Events page more compact by removing the camera selection grid. Selecting cameras is done using the floating action button in the bottom right corner
• Never delete a frame from memory if it is still the current frame. Should reduce some intermittent errors in the logs
• Use the ffmpeg hls_flags program_date_time option to get the exact creation time for segments. Previously milliseconds were discarded causing some timing issues
• Use settings under recorder for transcoding the generated segments

[netlify[bot]]

✅ Deploy Preview for viseron ready!

Name	Link
🔨 Latest commit	2e4a1b74c2b3ffbae7c3a794d05dbdbf5f5efadf
🔍 Latest deploy log	https://app.netlify.com/sites/viseron/deploys/66b4c0b5aeb77a0008d2b88c
😎 Deploy Preview	https://deploy-preview-793--viseron.netlify.app
📱 Preview on mobile	Toggle QR Code... Use your smartphone camera to open QR code link.

---

To edit notification comments on pull requests, go to your Netlify site configuration.