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.
Replaces OneTrueSlash with full user-install support:
- Single proxy slash command bridges all text commands
- Works in servers, DMs, and group DMs
- REST API patcher sets integration_types & contexts on all global commands
- Owner commands: [p]userslash sync/patch/status
- Fuzzy autocomplete (rapidfuzz)
- Enhanced InterContext/InterMessage for non-guild contexts
