This reworks NameBuilder to ease the transition to the system where
the model will be guaranteed to never contain any name collisions, both
between user-specified names and the automatic ones.
- change the font of the emitted graph to `Courier`, which is the only
monospace font graphviz guarantees to support
- tweak color of the union definitions to be slightly lighter (so that
it doesn't clash as much with the other colors used)
- change the color of all the "other" nodes (like typedef) from white
to grey, so that they are visible on light backgrounds.
- leave a todo about `buildFieldName` being obsolete.
Before this commit, the TypeSystemPrinter implicitly assumed that
model::Function and model::DynamicFunction always had a prototype.
However, this is not guaranteed by the model schema.
This commit extends the TypeSystemPrinter so that it doesn't make that
wrong assumption anymore, and can successfully print any model::Function
and model::DynamicFunction, even when a prototype is not present.
Pietro Fezzardi