Implement camera support for camera.rpl

[capitalistspz]

Done using the openpnp-capture library.

• The colours are completely wrong
• Only functional if camera has a 640x480 mode
• May not be performant
• Has only been tested on Linux

Closes: #103

[capitalistspz]

Tested against:

Camera App:
Consistently able to display camera output at launch, but after a while stops capturing frames.

Mii Maker (EUR v50):

Most of the time black screens and freezes when entering the QR code scanning screen. Occasionally displays the camera output correctly, and when it does, pressing 'Close' freezes the game.

[capitalistspz]

At this point it seems that the camera is functional in both Mii Maker and my app.

There's a minor issue with Mii Maker: QR codes that are recognised with the Wii U Gamepad's camera are not recognised with this camera output.

[qurious-pixel]

recursing the submodules, or at least dependencies/openpnp-capture/ and building it during the build-appimage job makes available the dependency.

    - name: "Install openpnp-capture dependencies"
      run: |
        cd dependencies/openpnp-capture/
        cmake -Bbuild -DCMAKE_BUILD_TYPE=Release -DCMAKE_INSTALL_PREFIX=/usr -GNinja
        cmake --build build
        sudo ninja install -C build