[2027] flatten all namespaces

[virtuald]

Only keep toplevel namespaces like wpilib, wpimath, ntcore, etc. Might make exceptions in wpiutil, we'll see.

[TheTripleV]

Are you thinking of changing the namespaces in the bindings?
Or generating an __init__.py that imports the subpackages as * to flatten them there?

[virtuald]

Changing all the namespaces.