Runtime module loading improvements

• Improvement for loading the various runtime modules. The bug was related to EE containers, where the runtime classes and the API class were loaded by a different Class loader.
  Fix contributed by @nemeth-z! Thanks again!

• The module is now only built/verified with the latest JDK version. Support for older versions is kept through compatibility settings... meaning Java 1.7 is still supported.

Annotated-only mode support

Added new source level annotation for marking classes and methods to be instrumented in case of running with the annotated-only mode of GhostWriter. For details check the core repository's README.