Refactor Pane

[a-usr]

Refactor Pane somewhat according to https://github.com/zellij-org/zellij/blob/1dbd14f277ceff89588adf6d8db10d856c310e69/zellij-server/src/tab/mod.rs#L206

As of now I've added a enum (Pane) which holds either a TerminalPane, or a PluginPane, and derefs to the PaneTrait (previously just Pane) trait.

Things I need to know:

• [ ] What methods from the PaneTrait trait to move to PluginPane and TerminalPane respectively
• [ ] Wether zellij-server/src/panes/mod.rs is an acceptable (new) home for both the Pane enum and the PaneTrait trait (PaneTrait seems kind of out of place in zellij-server/src/tab/mod.rs)
• [ ] Wether I should rename PaneTrait to something better (and what)

Other Ideas and suggestions are more than welcome

Regarding the methods that should be moved

Here is a quick list of methods that I think might be better off outside of PaneTrait:

Methods that I might be better off in TerminalPane

https://github.com/zellij-org/zellij/blob/1dbd14f277ceff89588adf6d8db10d856c310e69/zellij-server/src/tab/mod.rs#L483

https://github.com/zellij-org/zellij/blob/1dbd14f277ceff89588adf6d8db10d856c310e69/zellij-server/src/tab/mod.rs#L486

https://github.com/zellij-org/zellij/blob/1dbd14f277ceff89588adf6d8db10d856c310e69/zellij-server/src/tab/mod.rs#L493

Methods that might be better off in PluginPane

https://github.com/zellij-org/zellij/blob/1dbd14f277ceff89588adf6d8db10d856c310e69/zellij-server/src/tab/mod.rs#L475-L477

Q&A

Q: Why make this Draft instead of just coding away?

A: Because I prefer gathering info and tips before doing a somewhat huge amount of changes over having to scrap 90% of my code because it doesnt conform to the general vision of the Maintainers

Q: Why this?

A: Because Im currently working on another (smaller) change, and I dont want to have to write Spagetti Code to make it work. And Im sure the Maintainer(s) dont want me to either.

[a-usr]

Im just gonna let this sit here for the next week or so, and hope the people that need to see this do.