The file userslash/commands.py shadowed redbot.core.commands when Python
registered the submodule on the parent package, causing:
AttributeError: module 'userslash.commands' has no attribute 'Cog'
Renaming the file to slash_bridge.py avoids the collision entirely.
Also adds a user-install whitelist feature:
- [p]userslash whitelist enable/disable
- [p]userslash whitelist add/remove @user
- [p]userslash whitelist list
- [p]userslash whitelist clear
When enabled, only whitelisted users may use the bot via user-install
(DMs, group DMs, non-member guilds). Guild-installed usage is unaffected.
d20f988a93