First start at a central paginator system

[Andre601]

Pull Request

Pull Request Information

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My PR is for the Menu module of the JDA-Utilities library.

Description

This is my initial PR on a Button-based Paginator system.
It puts the entire pagination handling into a new class called the PaginationHandler which will be the new main place for pagination to be handled.

The plan is, that the menus will call new PaginationHandler(<values>).displayWithButtons(MessageChannel) to display a new paginable menu.. Either with buttons or the old-school reaction.

To-do

• Add support for Reactions
• Maybe: Find a way for a more generic event handling. Essentially have one method for both ButtonClickEvent and MessageRactionAddEvent.... They seem to be incompatible tho and simple instanceof checks won't do it....
• Deprecate stuff like all the Strings for Unicode in the different menu classes and mention to switch to the new central strings to use...
• Something else I completely forgot....

[Andre601]

Did some more work on the entire pagination stuff...
The main thing I did was adding a PaginationButton sub-class in the Handler to have a more easy way of handling both reactions and buttons in terms of Emotes/Emojis.

I think the stuff should be in a usable state now, but it would require to move the handling of the different menus to the main paginator, make sure there isn't any conflicts and then test it....

[Andre601]

I decided to start this one again from scratch with a different aproach.