Enhance framework ConservativeAdvection with full upwinding option

[WilkAndy]

Rationale

The ConservativeAdvection Kernel is of limited use currently because it includes no numerical stabilisation. I think it's really mainly a teaching tool on how to make MOOSE Kernels but wouldn't ever be used in any real simulations because of the crazy over/under shoots that it yields. Including some stabilisation would be instructive for coders of MOOSE (they'd see nodal Values, not just normal _qp stuff) and would also allow this to be used in real simulations. I want to include a full-upwinding option: someone else can do SUPG or something else if they really want to.

Description

Make a MooseEnum that will let the user specify the upwinding type used: it defaults to "none"

For upwinding_type = none, just do what's currently in ConservativeAdvection

For upwinding_type = full, perform full upwinding. That is, look at the velocity at each node. Some nodes will have total outflow>0: evaluate the residual at these nodes based on their value of u. Other nodes will have outflow<0: they get the flow from the outflow>0 nodes.

Impact

As a teaching tool for how to do something slightly more complicated with Kernels, as well as making ConservativeAdvection more useful in real simulations.

[WilkAndy]

@permcody , i had intended this was framework ConservativeAdvection, not modules

[permcody]

Thanks