Package internal access

[oscbyspro]

🪨 Public underscore bad. Access control good. Me annotate functions 🪨

[oscbyspro]

There are two utility methods in ANKFoundation that could benefit from a package internal access modifier. It may also be worth considering if utility methods in other modules should be promoted to ANKFoundation with this feature. Like, the UInt arithmetic methods in ANKFullWidthKit, for example.