fixed incomplete ClassGeneratorTest
fixed incomplete ConstantGeneratorTest
fixed incomplete DocumentationGeneratorTest
marked a lot of functions as final
refactored body generation, empty lines are only added if needed
started FileGeneratorTest
added property test
renamed "setIsPrivate" to "markAsPrivate" and more in method
renamed "setIsPublic" etc. to "markAsPublic" etc. for method generator
added incomplete tests
added addClass test