Feature/simplify local view

Fixes #1060 (closed)

• Make sure I'm even doing this correctly

• Change bind interface for each discretization's fvelementgeometry.hh

• Change bind interface for each ELemVolVars

• Change bind interface for each FluxCache

• Go through all dumux/ headers and replace useage

• Go through all test/ headers and replace useage

• Add a note to the change log

• Perform Benchmark to evaluate cost localview call within or outside of a element loop

• Make changes according to the Benchmark results:

Policy here:

1.) If bind(element) is called within an element loop, call auto fvGeometry = localView(gridGeometry) before the loop.

2.) If bind(element) is only called once (e.g. in certain functions), use the convenience syntax.