[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?