Finish transition to "new style" templates.

[rec]

timedata has at this writing three ways of automatically generating Cython (.pyx) code.

• Struct: We read structs from .h files and generate .pyx files.
• Old-style: We put together four Cython classes from two large, complex template files.
• New-style: We put together a large number of Cython classes from a large number of template fragments and some configuration files.

"Struct" isn't changing.

We don't have a New-style ColorList yet. Once we do, we can obsolete the Old-style entirely, and then delete all that code.

The advantage of New-style includes the ability to have multiple Color models, but also the possibility to extend to non-Color Samples and methods that are only applicable to one specific type.

[rec]

Finally! :-)