Make streams work with the new RPi setup

[ddabble]

Proposed changes

New features

• Made machine streams work with the new Raspberry Pi setup
  • Also, only the visible streams are connected to; once the page is scrolled so that a stream image is no longer rendered, the stream for that machine is disconnected, which makes the machine list page use considerably less data (depending on how the page is scrolled)
  • This does not apply to the machine detail (calendar) page, as there is always only one stream on the page

Improvements

• Added edit and delete buttons on the machine detail (calendar) page

Fixes

• Fixed sometimes being unable to close fullscreen machine streams, when clicking the close ("X") button

Areas to review closely

Code related to the streams, and how it behaves on (network) disconnection, on different devices and when scrolling the machine list page.

Checklist

(If any of the points are not relevant, mark them as checked)

• [x] Created tests that fail without the changes, if relevant/possible
• [x] Made sure that your code conforms to the code style guides and that any common code smells have been addressed
  • (It's not intended that you read through this whole document, but that you get yourself an overview over its contents, and that you keep it in mind while taking a second look at your code before opening a pull request)
• [x] Added sufficient documentation - e.g. as docstrings or in the README, if suitable
• [x] Added your changes to the "Unreleased" section of the changelog - mainly the changes that are of particular interest to users and/or developers, if any
• [x] Added a "Deployment notes" section above, if anything out of the ordinary should be done when deploying these changes to the server

[ddabble]

Merging without approval, as the Dev committee is slightly understaffed :)))

[codecov[bot]]

Codecov Report

Merging #477 (25a143e) into dev (5f877ab) will increase coverage by 0.38%. The diff coverage is n/a.

@@            Coverage Diff             @@
##              dev     #477      +/-   ##
==========================================
+ Coverage   88.12%   88.50%   +0.38%     
==========================================
  Files         133      132       -1     
  Lines        5531     5507      -24     
==========================================
  Hits         4874     4874              
+ Misses        657      633      -24     

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