Generators does not find artifacts from subdirs

[ivanvaccari]

Suggestion

Generators may search for artifacts in the target folder and* subdirectories

Use Cases

Whan you have a lot of models(>70 in my case), you can group them in subfolders for better organization. But then generators cannot find them and, as example, relations cannot be genearted since the wanted models are not found.

Other info

Im' aware of #6591 about the generation, i'm ok with this since i can always move the files after the generation, but then they become "lost" from a lb4 command point of view and cannot be used anymore for artifacts auto-generation.

[achrinza]

See: #7826