case-insensitive-enums

[hokiedsp]

Yannick,

Here is a quick take on making Praat enums case-insensitive.

Donno if this is the direction you'd like to take, but it's an easy mod. Take a look.

P.S., test_enums.py was added more for my verification and demonstration to you. Feel free to delete it if you decide to add this feature.

[hokiedsp]

I have no idea why only 1 macos test failed...