Make all constructors side-effect-free

[vinjana]

Currently, there is code, that just instantiates an instance -- even without parameters, using the a default constructor -- that parses from the input. A nightmare for maintenance and code clarity.

Extract all parsing code from constructors.

Note that this is not easy, because also the business logic and the index-mapping leakage is intertwined with the parse code.

Implementation Suggestion

1. Parse the input into an abstract table structure (without types; e.g. using rapidcsv, which is already used by SOPHIA > 35.0.0).
2. Parse and interpret the fields into objects. This may be possible with rapidcsv already (with constructors that take strings), but better would be to have static parse functions or even to have a factory or dedicated parser class(es), or so (to keep the parse code out of the objects).