Variable output file names

[basejumpa]

Following requirement shall be satisfied by HamMocKing:

• Req_HammocKing_0001: There shall be an optional command line argument to define file names of the output files. Templating-Engine shall know about the filename(s). Usecase: gmock/mockup.cc.j2 contains an include-statement which needs to be adapted to the target filename of template gmock/mockup.h.j2.

Additional work shall be done within this issue:

• Add a new chapter "Design" to documentation (in a new file)
• Add a new chapter "Requirements" to documentation (in a new file)
• Start the list of requirements with above one.

We need a new release for it by the end of 2022CW36.4.THU because spldemo needs it via dependendy to spl-core .

[basejumpa]

Suggested design alternatives:

Alternative_A:

$ hamMocKing --defines "comp=CurrCv" alex would lead to renaming from template mockup_{comp}.h.j2 to output file: mockup_CurrCv.h

Alternative_B:

$ hammocking --suffix _CurrCv .... # Internally the template engine needs variable ${suffix}

We prefer _B. Reason: We postpone _A before we implement the user defined template directory.