Reactionmenu

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Bug Fixes
* Fixed an issue where if a menu's timeout was set to `None` and the `navigation_speed` was set to `ReactionMenu.FAST`, an error would occur

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New Features
* Added the ability to start a menu in a specific channel

Bug Fixes
* Fixed an issue where custom embeds in a dynamic menu would not display all implemented values from that embed

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New Features
* Added `ReactionMenu` kwarg `navigation_speed`. Used with the below class attributes
* `ReactionMenu.NORMAL`
* `ReactionMenu.FAST`
Bug Fixes
* Fixed an issue where if multiple menu instances were created and stopped in a single execution, calling `ReactionMenu.stop()` could stop the wrong instance

* Fixed an issue where if an exception was to occur during the startup of a menu, exceptions such as discord.py's "missing permissions" exception would be suppressed and not be displayed

* Fixed an issue with `Button` objects where a duplicate name/emoji could be used

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New Features
* Small additional update for `v1.0.3`. Support for `client.command()` functions to be used with `ButtonType.CALLER`

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New Features
* Added the ability for buttons to call functions
* Added new `ButtonType` (`ButtonType.CALLER`)
* Added class method `ButtonType.caller_details()`

Bug Fixes
* Fixed an issue where all exceptions were suppressed specifically inside the execution method

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New Features
* Added class method `ReactionMenu.get_sessions_count()`
* Added the option to delete the messages sent when interacting with the menu via `ButtonType.GO_TO_PAGE` (`ReactionMenu` kwarg `delete_interactions`). Repeatedly using `ButtonType.GO_TO_PAGE` can sometimes make the chat look like spam

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