Add profile information to the visual test files

[alexanderbock]

Instead of taking the folder name as profile, the folder is now purely for organizational purposes and used to determine the group of the test (see OpenSpace/OpenSpaceVisualTesting#4)

Closes #197

[ylvaselling]

Nice!

My only comment is that maybe having the additional interface over the lua scripting might require more maintenance when we update the lua api, than just passing through pure lua? I suppose that would require a wait function though. Just a thought

[alexanderbock]

It's a good point and the missing wait is definitely something that would prevent us from using it right now. I'm also thinking that we'd want some user interface to create these tests in the long run, which would be harder if they are just bare Lua scripts.