Add warning for star import not found on project classpath

[eric-milles]

Consider the following:

import foo.bar.*
import foo.bar.Baz.*

...

When building, warning/error should be produced for each import statement if package "foo.bar" is not part of classpath. Each of the other 3 types of imports produce errors for non-found types. JDT tools provide a problem marker in Java for these cases.