Move freeze curve code to registered Julia package

Additional changes:

• Types no longer have Param values by default. They must be added by the user or by the parameterize method which automatically wraps all numerical quantities with Param.
• Prognostic on-grid variables now have flux terms j[x]defined automatically.
• Refactored heat conduction and non linear diffusion implementations.

assigned to @bgroenke

added 1 commit

• 91da3854 - Bump minor version

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approved this merge request

added 7 commits

• ada2788e - Move freeze curve code to FreezeCurves.jl
• 729d6a4b - Replace default Param values with parameterize
• db2dadc8 - Add layer as argument to variable initializers
• 7598c45a - Fix failing test
• 437987a9 - Add diagnostic flux variables and rework nonlinear diffusion impl
• 28b0a459 - Fix (new) bugs in state handling
• c85689f4 - Bump minor version

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merged

mentioned in commit dbd55040