Change .gpla format to binary, improving performance massively

[DJLevel3]

As described above, the .gpla file is now a binary format that performs far better on save and load. Technically it's base64 encoded so it still works with the file save and load functions built into osci-render, but the decoded data is pure binary.

[jameshball]

Platforms and software tested

List any platforms tested. E.g. Windows or macOS

Also list any DAWs you are using to test. E.g. Ableton, Reaper, Logic.

Testing performed

Describe in detail any testing you've performed that is specific to the feature or bugfix this PR addresses.

Testing checklist

• Tested PR on the standalone app
• Tested PR when using as an audio plugin, e.g. VST or AU
• Added unit tests to osci-render-test.jucer project when relevant
• Checked that any parameters added or modified can be changed from a DAW and have the value updated in the GUI and vice versa
• Added tooltips to any new labels or buttons to explain them
• Made sure any new effects or sliders added still work when the range of the slider is changed

[jameshball]

Thanks for the PR this is awesome work! Do you mind filling out the template above for testing so I have an idea of what has been tested? Not everything is relevant to this PR so just remove it if you think it's not relevant.

Once you've filled out the template I'll try and do a proper review :)

[DJLevel3]

Platforms and software tested
Windows Ableton and Standalone

Testing performed
Approximately 4 hours of use on various Blender projects and methods of making music, zero crashes or issues.

Testing checklist

• Tested PR on the standalone app
• Tested PR when using as an audio plugin, e.g. VST or AU
• Added unit tests to osci-render-test.jucer project when relevant
• Checked that any parameters added or modified can be changed from a DAW and have the value updated in the GUI and vice versa
• Added tooltips to any new labels or buttons to explain them
• Made sure any new effects or sliders added still work when the range of the slider is changed

[DJLevel3]

Fixes #239

I need to do a bit of testing to ensure stability, but this fix makes the frame update to the newest frame in the queue instead of the next frame in the queue, ensuring that the animation is at most 1 audio block late. This might be possible to reduce to 0 blocks, I'll see if I can make that work soon.

[DJLevel3]

0 blocks doesn't appear to be easily possible without significant rewrite of the audio processing code, so I'll leave it like this for now. Beginning testing.

[DJLevel3]

...or I may have forgotten to enable plugin copy so I wasn't actually testing the changes 🤦

[DJLevel3]

Platforms and software tested

Windows - VST3 in Ableton, Standalone

Testing performed

I have tested a very large GPLA file at high framerate along with the default OBJ file, and everything works as before except the frames now update when stale so there's not a large delay before the frame updates when starting a new MIDI note after some time not playing the previous one.

Testing checklist

• Tested PR on the standalone app
• Tested PR when using as an audio plugin, e.g. VST or AU
• Added unit tests to osci-render-test.jucer project when relevant
• Checked that any parameters added or modified can be changed from a DAW and have the value updated in the GUI and vice versa
• Added tooltips to any new labels or buttons to explain them
• Made sure any new effects or sliders added still work when the range of the slider is changed

[DJLevel3]

Strange sounds are happening, I think I know what's wrong though

[DJLevel3]

Fixed

[DJLevel3]

Switched to a new PR, but code is largely the same. Regardless, I'm closing this PR now.