Support for embedded Object declarations

[jakobmygind]

Not the prettiest string manipulation, but it seems to work with struct and final class

[jakobmygind]

Changes: Instead of throwing an error when locating several declarations within one model, we now first extract the embedded model then recursively extract the remaining occurrences and prefix the model name with the parent's name plus ".". The model strings are then passed to the model generator one by one, and the results are concatenated.