[orx-boofcv] Add first test

[hamoid]

Here my first attempt at adding tests to orx'es.

• Is it the right approach to use nullgl? If I don't it fails to create an application, but I'm not sure if this is the right solution. Also it's not ideal because with nullgl I couldn't use drawImage or a render target if I recall correctly.
• I noticed that the orx'es inside orx-jvm use a different folder structure: they do not have mainJvm, demoJvm, testJvm but only main, demo and test. Is this something that needs to be changed eventually?

[edwinRNDR]

The folder structure is different because it uses the kotlin plugin through kotlin("jvm") instead of kotlin("multiplatform"). I think it is best to keep using the jvm variant and use the module structure that comes with it.

[edwinRNDR]

You should just test with openrndr-gl3 btw. You can have a look at how that is done in openrndr-gl3 itself.

[hamoid]

orx-boofcv uses the kotlin-jvm convention. I don't see any cases where packages using that convention have tests. openrndr-gl3 uses the kotlin-multiplatform convention.

I tried copying the test parts of its gradle file to orx-boofcv but it wasn't that happy.

If you could give more tips or make a working example I could work on adding tests to orx'es.