Import from anywhere

[georg-schwarz]

Closes #593

[georg-schwarz]

Ran into a roadblock in the implementation. The interpreter somehow doesn't pick up the hook added it seems. Asked for help in eclipse-langium/langium#1308 (comment)

[rhazn]

While the code itself looks fine to me, I still get errors trying to run models with imports from above them if the interpreter runs from the same directory as the model:

error: Import from "./../../shared/transforms.jv" could be resolved. Check if the file exists in the given location.
$In <path removed>model.jv:15:8
15 | } from "./../../shared/transforms.jv";

[rhazn]

Looks good to me and works on my machine :).