Integrate compilation of java, class, jar files

[rahulmutt]

ghcvm --make SomeClass.class SomeOtherClass.java SomeJar.jar SomePure.hs

Should convert all the given files to class files accordingly and properly put them in the resulting jar. Currently, it's partially implemented (should work in batch mode -c) but needs to be tweaked for --make mode. In particular, we need to make sure we set the -classpath flag of javac properly, taking into account references to the module closures compiled in the same batch.

Implementation Sketch:
Separate out .java files and compile them only after all other compilation units and include all the compiled .jars as dependencies.