The pywriter is a mess

[sebastianriese]

The pywriter is in many places inelegant, error prone and difficult to understand.

The implementation of generation options is completely ad-hoc and hard to follow, this should be replaced by an elegant, extensible and clear general mechanism.

Preferably on assembles a Composite, each of which components represents an option. Then the correct code is written automagically.

[sebastianriese]

The messiness of the pywriter has been mitigated by factoring out the Parser and Lexer standard implementations to a runtime library. Yet is it still not good and will get worse again, as soon as mapping via multitables will be implemented.