resolved issues with treatment of plugin files
-depending on the main executing class, e.g. Carma, CoreASMPlugin (in Eclipse), the import of plugins has to be treated in a specific way. Now, plugins are imported from the engine lib. Redundancy of plugin folders has been removed. The engine library can be loaded from either a bundle resource, a jar file, or the file system.
Signed-off-by: mstegmaier <michael-1.stegmaier.uni-ulm.de>, marcel.dausend <marcel.dausend@uni-ulm.de>