Add support for user defined liquidProperties

Functionality to add/problem to solve

Currently only hardcoded liquids can be used for modeling Lagrangian particles such as water and a few selected hydrocarbons. This limits the possibility of modeling liquid injection for cases other than liquid fuel combustion.

Target audience

Users who want to model injecting ammonia for nitric oxide reduction.

Proposal

Implement similar functionality to what is available through generic liquid.

Funding

I already have a working implementation and can provide the patch/merge reguest.