Add UI support for custom Python operations

[SamCarlberg]

Screenshot

Issues

• The text 'editor' is just a TextArea, might want to make it more full-featured
• Poor layout for the Create New button
• Need to add something to the wiki explaining how to make sockets (after PR gets merged)

[codecov-io]

Current coverage is 53.19% (diff: 18.21%)

Merging #640 into master will decrease coverage by 1.38%

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+ Hits           3665       3703    +38   
- Misses         2882       3089   +207   
- Partials        168        169     +1   

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[AustinShalit]

I think the "Create New" button needs a margin.

When searching for operations, what do you think about getting rid of the categories and just showing operations?

[AustinShalit]

Also: https://github.com/TomasMikula/RichTextFX

[SamCarlberg]

I think it's good to keep search results separate, it makes it easier to know what category the operations belong to. Unless if it turns out that people use the search bar for the majority of the time.

[AustinShalit]

closes #470

[SamCarlberg]

I think we're going to need to use the official OpenCV python libraries instead of accessing the Java bindings through python.

[JLLeitschuh]

Are we waiting on this for the opencv library change?

[SamCarlberg]

Haven't had the time to figure out how to deal with the OpenCV python libraries

[SamCarlberg]

So this is going to be interesting. We don't need to include python bindings for OpenCV (you can just use pip install opencv-python). But we will need a way of converting the JavaCV mats to and from numpy arrays

[JLLeitschuh]

Write a library to emulate numpy in jython

[ianfinlay-aus]

I like this feature: was thinking how to dynamically add OpenCV2 calls into the tool, amd import/export the custom library for sharing

[SamCarlberg]

Wow, this is an old PR. IIRC it never moved forward because it's really just a python wrapper around the java libraries (which are wrappers around the C++ library...), and wouldn't support the normal python libraries people would use to interface with OpenCV like numpy or opencv2