Type mapping and @Erased ignored in some cases

[chfeiler]

Fix for the following issue: Type mapping and @Erased annotation ignored #479 The following has changed:

• imports are not included anymore if the imported class is erased by @Erased or mapped to a different type.
• interface methods are not automatically added to an abstract class if the interface is mapped to a different type or is annotated with @Erased

The @Module annotation still works even if the referenced import is mapped or erased. All test passed on my local machine. Hope this fix does not limit other use cases:)

[renaudpawlak]

I am trying to catch up a bit here. Thanks. Looks simple and not risky to merge. Would you have time to write a unit test on this one before we merge it? There are some similar tests that you can use as a start in the test code base.

[chfeiler]

I added a simple test, that would fail if the issues of #479 were still there. Luckily everything passes:)

[renaudpawlak]

Looks good to me :) Thanks