Import wildcards and implicit java.lang.*

[Brofian]

Changes

• The grammar and parser now allow for import wildcards like import java.lang.*
• If no discrete import matches a simplified class name, every wildcard is tested (from first to last) as the package name of this class. The first match will be used for the fully qualified name, or otherwise the current package is used
• If not specified explicitly, the semantic check will add the java.lang.* as an implicit import. This removes the requirement of importing classes like java.lang.String or java.lang.Object
• This fixed a bug, where an implicit java.lang.Object parent would be converted to <current-package>.Object

This will resolve #21

[JakubSchwenkbeck]

This looks really good! :)
I totally overlooked the wildcards for imports when starting the ASTBuilder, thanks for the fix:)