Move token up to the bot struct rather than the client

[PaulSonOfLars]

What

Move the bot Token up to the bot struct rather than the bot client

Impact

• Are your changes backwards compatible? No - this will cause compilation errors on outdated code. Majority of users should not be affected - only users of middlewares, due to interface changes.
• Have you included documentation, or updated existing documentation? Y
• Do errors and log messages provide enough context? Y