Add devel/py-marrow.util: Commonly shared Python utility subclasses and functions
Marrow Utilities Collection
This package contains many commonly reimplemented utility classes and functions
covering the following major areas:
- attribute, partial/subset, case-insensitive, and multi-value dicts
- py3k source compatibility (without using 2to3)
- string to rich datatype conversion of bools, simple arrays, and complex keyword/tag parsing
- rich OOP helpers: nested list flattening, a NoDefault implementation, dot-notation object loading, and a LRU cache
- path manipulation
- UTC, universal time constants, english to numerical month and DotW conversion, and date field range constants