Handle Scala multiline imports

 Fix the block creation algorithm so that it can handle multiline scala imports.
Example:
```
import users.User  // import the class User
import users.{ 
  User, 
  UserPreferences
}  // Only imports selected members''';
```
This code should return:
```
[FB(startLine: 0, endLine: 4, type: FBT.imports)]
```