[V3] supress pynacl warning

[mikeshardmind]

Type

• Bugfix
• Enhancement
• New feature

Description of the changes

Supresses an irrelevant warning about a lack of pynacl from discord.py

[tekulvw]

This is likely a better fit for redbot/__init__.py

[palmtree5]

I'm still seeing the message
PyNaCl is not installed, voice will NOT be supported
on startup when running this branch

Works fine after reverting the move to init.py

[mikeshardmind]

We didn't have a module import in __main__.py which meant the version checking didn't happen in there either when started from one of the console scripts. Changes are back in __init__.py as requested, with a module import added to __main__.py

[mikeshardmind]

I've put the changes back in bot.py

Reasoning:
It may appear to be a global flag, but it isn't used as one (and doesn't make sense to be used as one), discord.py sets this to false immediately after warning if it is True. This shouldn't ever be expected by anything to be True past the creation of the client.

This also avoids the behavior of a duplicate import warning when the bot is launched using python -m redbot