release 1.3.0:
implement the source java searcher:
this allows the builder to only build some class files instead of all
when one (or some) have been changed.
the dependency detection can easily detect false dependencies, but
should usually not fail to detect dependencies.
exceptions are:
+ a folder exists with the same name as a class
+ the dependency is in from a different scope
+ these dependencies are currently also not detected by the
all java searcher.
remove removed files:
also the package/install compiler now delete files that have been
removed from their source directory