Feature/pass localresidual to assembler

Timo Kochrequested to merge
feature/pass-localresidual-to-assembler into master

Enable passing LocalResidual from outside to the FVAssembler. This allows to set the LocalResidual from the main file. However, we still need to set the LocalResidual property. Although not used by the assembler it is still used by the local residual implementation itself to realized CRTP.

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