ENH: parameterization of hopper blockMeshDict

I've parameterized the blockMeshDict for the hopper simulations for a own case using the variables and the modern #eval function. This makes the blockMeshDict much more readable and could serve as a template for users writing blockMeshDicts. Would it be possible to push this the develop version? I can imagine it is a hectic time during the release. Just let this sit until afterwards.blockMeshDict