Dpymenus

Fixes a security issue in the `urllib` dependency for versions prior to 1.26.5.

Changed

- Optimized how menus handle reaction events in different channel types.

Changed

- Fixed a regression where buttons weren't being handled safely in DM's.
- Fixed an uncommon occurrence where closing menus would raise an AttributeError instead of returning.

Changed

- Fixed a bug where PaginatedMenus did not check for an existing cancel page when closing *(`.set_cancel_page()`)*.

Changed

- Fixed a bug where closing out certain menus would result in trying to remove reactions on None-types (see 54).
- Fixed a bug with input logic flow on button menus that would result in raising InvalidArgument errors.
- Fixed a bug where session force closing would raise an InvalidArgument error.

Added

- Session settings for users can now be set. Please note the system isn't complete yet, but you can now keep
multiple menus alive at the same time, or have the earliest one close if there are too many. Currently, only the
user limit applies. Please see [the book](https://dpymenus.com/sessions.html) for more information.

Changed

- Updated several book instructions in regard to installing and running examples on Windows.
- Removed an old dev dependency carry-over from the example runner *(uvloop)* that caused issues on Windows.