Use filetreelist crate

[abergmeier]

No longer safe Status inside of FileTreeItem. For Status storage, now introduced a new Item, which contains Status alongside FileTreeItem.

Note that FileTreeItemKind is no longer publicy available - thus we cannot store this enum anywhere anymore.

I followed the checklist:

• [ ] I added unittests
• [x] I ran make check without errors
• [x] I tested the overall application
• [x] I added an appropriate item to the changelog

[abergmeier]

~~So far change component shows no diff - not sure why~~

[abergmeier]

I think for being able to write unittests I would need to extract a lot of traits for components.

[extrawurst]

All good the tree component itself is pretty well tested

[extrawurst]

While reviewing noticed that it still has its own FileTreeItems instead of using the one from filetreelist-crate. We should make it use the crate one

[extrawurst]

putting in draft till the next round of reviews

[abergmeier]

While reviewing noticed that it still has its own FileTreeItems instead of using the one from filetreelist-crate. We should make it use the crate one

The reason is that filetreelist crate knows nothing about status. If you want to use it I see 2 basic ways of doing it:

1. Introduce status to filetreelist crate
2. Have a separate "list" for status

How do you want handle that?

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