Replace local energies by local densities

• wrap the densities by a generic IntegralEnergy
• this preserves all material properties
• reduces redundant code

First draft. HenckyEnergy as an example implementation.

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Update: all energies rewritten. finite-strain-elasticity.cc adjusted.

Nice, thanks! However, I am tempted to say that all these new density classes should have their own files. Because some day we will remove those deprecated energy classes, and then it'll be weird to have 'density' classes in 'energy.hh' files. Better do it now.

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@oliver.sander_at_tu-dresden.de MR updated.

Thank you! I hate to say this, but I have one more round of wishes...

• Standard Dune indentation is two spaces per indentation level. Please use that for new files.
• Let's call the classes and files FooBarDensity (foobardensity.hh) rather than FooBarEnergyDensity (foobarenergydensity.hh). The names are long enough already.
• A changelog entry
• You need to add the new files to CmakeLists.txt

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@oliver.sander_at_tu-dresden.de MR updated fulfilling your wishes :)

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edit: forgot two files in CMakeLists.txt

Great, thank you!

merged