Add typed-map interface/implementation for paint/place. (#929)

Builds on PR #918 

Prepare public API on `cable_cell` for substitution of discretization implementation in `fvm_layout`.

* Add `mcable_map` for representing cable-wise constant data on a morphology.
* Paint cell ion initial values and physical properties by specific setter types, replacing use of `cable_cell_local_parameter_set`.
* Allow cell default ion/physical properties to be set via same setter types, which set corresponding fields in cell's `default_parameters` field.
* Store placed/painted items each in a `static_typed_map` object in the cable cell implementation class; provide public access method to typed maps.