Add alphaplan FWR generator

alphaplan_fwr.py: Creates alphaplan software packages for the build
release artifacts. According to the release, all relevant artifacts are
collected in a list structure and the corresponding aphaplan
information are added for each artifact (attributes, md5sum, path, etc.).
The list is attached to major software package structure. This structure
is written in a json file for documentation. Afterwards the structure is
send to an AlphaPlan webservice that creates the FWR articles.
alphaplan_keys.py: Generates a dictionary which contains all AlphaPlan
specific information for the artifacts. Flag classes are used to define
unique keys for the dictionary accesses.