feat(gui): Pin tabs

[Mino260806]

• Pin button replaces close button when pinned , clicking the button unpins the tab
• Pinned tab cannot be closed by any mean (Close, Close All, Close All Right, Close Others)
• Pin action automatically places pinned tab at index 0 (inspired from intellij)
• The state of being pinned is saved along "Save project"
• Frame for displaying pinned tabs

I think I need to ask you before implementing the last change. It would be hidden by default, and opened through View > Pinned Tabs. Please see below image. I'm waiting for confirmation

My draft for pinned tabs frame

Edit:
The pinned tabs frame can also serve to display other kinds of tabs like bookmarked tabs, so once it's ready, I can PR bookmarks feature (#1078), and rename the frame to "quick tabs frame" or something similar

---

closes #1809
closes #847
closes one of the suggestions from #1684

Icons from: https://intellij-icons.jetbrains.design/

[skylot]

Frame for displaying pinned tabs

@Mino260806 sure, this looks fine and can help navigation if the user pinned a lot of tabs.

And, for such optional panels, using some kind of dockable framework will be great (ModernDocking looks quite active), but this will be a huge task to do 😭

[Mino260806]

And, for such optional panels, using some kind of dockable framework will be great (ModernDocking looks quite active), but this will be a huge task to do 😭

I think this deserves to be a seperate PR. ModernDocking seems to also support split panels and tabbed panes.
So if we start using ModernDocking, it's better to migrate other components like code split view, jnode tabbed pane, etc to preserve consistency of the codebase and the gui look.

So I'll implement this feature temporarily using normal swing framework, and then it shouldn't be difficult to migrate it to ModernDocking alongside other gui components.

[Mino260806]

Almost done, some small tweaks and then PR is ready

Quick Tabs Tree

[Mino260806]

@skylot let me know what you think!

[skylot]

@Mino260806 thank you! Great work 👍