Move interface methods/types to top level

README.md

docs/make.jl

docs/src/api/toplevel.md

docs/src/quickstart.md

examples/heat_freeW_samoylov_simple.jl

examples/heat_vgfc_samoylov_simple.jl

examples/heat_vgfc_seb_samoylov_custom.jl

examples/readme_examples.jl

src/Common/methods.jl

src/Common/types.jl

src/CryoGrid.jl

src/Layers/Layers.jl

src/Layers/soil.jl

src/Processes/Boundaries/Boundaries.jl

src/Processes/HeatConduction/HeatConduction.jl

src/Processes/Processes.jl

src/Processes/SEB/SEB.jl

src/Processes/Sources/Sources.jl

src/Processes/Water/Water.jl

src/Setup/Setup.jl