Install uStreamer without Ansible

Resolves #1600

As part of our continuing effort to eliminate Ansible from our install process, this installs uStreamer from within the bundle installer rather than during Ansible.

This is a slight implementation change in that we no longer download the uStreamer package at install time and instead pre-download it and include it in the TinyPilot bundle. This is preferable, as it does more work in the packaging stage and less work on user devices, though it does increase the size of our bundles by a few megabytes.

Manual tests

For expediency, I tested builds that combined:

1605
1606
1608

For the manual tests, I verified:

Video works under MJPEG and H.264
Changing video settings works

In these environments:

[x] Pro Voyager build
[x] Community bundle on top of bare Raspbian system
[x] Community bundle on top of bare Raspbian system with TC358743 enabled

Peer tests

To test this bundle (which combines the stack of three PRs mentioned above), run:

curl \
  --silent \
  --show-error \
  --location \
  https://raw.githubusercontent.com/tiny-pilot/tinypilot/master/scripts/install-bundle | \
  sudo bash -s -- \
    https://output.circle-artifacts.com/output/job/e70104a2-0f1f-43b7-abe9-098d6eac2799/artifacts/0/bundler/dist/tinypilot-community-20230831T0151Z-1.9.0-87+de1916a.tgz

tiny-pilot / tinypilot

Install uStreamer without Ansible #1606

Manual tests

1605

1606

1608

Peer tests

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