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Real-time 2D spectrogram plugin (LV2, VST and Jack)

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Look at how slow Wolf Spectrum gets after 20 minute of non-stop use: https://youtu.be/C92wFP0CG7c?t=1739 Could this be some problem with non-freed image memory or something?

bug :bug:
optimization

(Checked elements have been fixed) - [x] It doesn't close itself on focus out - [x] It doesn't indicate the selected entry - [x] It doesn't indicate hover on items...

bug :bug:
enhancement :gem:

If I run my own build of the v1.0.0 release of Wolf Spectrum inside a GTK 2 host, I am unable to resize the window by dragging the resize handle...

bug :bug:

new feature :heavy_plus_sign:

I guess it could be useful as some point to be able to render a spectrograph to a video file based on an audio file input. The original audio file...

new feature :heavy_plus_sign:

See baudline's color picker as reference: https://www.baudline.com/manual/color_picker.html The color scheme could be stored as plugin state. Then, we could get rid of [inih](https://github.com/wolf-plugins/inih).

new feature :heavy_plus_sign:

I would fix this using the usual `translate(0.5, 0.5);` trick, but it creates a gap between the textures...

enhancement :gem:

Here's comparison of how Log scale looks with different window sizes: Using 2048: ![image](https://user-images.githubusercontent.com/491704/52342690-5b3ecc00-2a16-11e9-9eb6-81fdec4313d1.png) Using 4096: ![image](https://user-images.githubusercontent.com/491704/52342601-25014c80-2a16-11e9-8a83-974d1fbfcfc9.png) Using 8192: ![image](https://user-images.githubusercontent.com/491704/52342661-4a8e5600-2a16-11e9-803f-c6b7b298db41.png) Using 16384: ![image](https://user-images.githubusercontent.com/491704/52342632-3c403a00-2a16-11e9-87ee-11c22da61eb0.png) It's a bit strange, but only the...

enhancement :gem:
needs research :microscope:

The line width of the bins seems somewhat incoherent. Also, I would expect less dark purple, and more black. Not sure if there's really an issue here, of if it's...

enhancement :gem: