WIP: Adds typedef for Volume in Geometry

Santiago Ospina De Los Ríosrequested to merge
santiago.ospina/dune-grid:feature/change-type-of-volume-method-to-typedef into master

Adds typedef for Volume in Geometry.

This breaks since OneDGrid geometry relies on AxisAlignedCubeGeometry of dune-geometry, and UGGrid relyes on MultiLinearGeometry as well hosted in dune-geometry. If this change is accepted, the Volume type has to be implemented in these objects as well.

Hopefully, many of the downstream projects rely on GeometryDefaultImplementation so that they don't have to change anything.

See #79 (closed).

Edited by Santiago Ospina De Los Ríos

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