Adds Item Starring and other FileBrowser changes

[AW1534]

Item Starring

Added the ability to star items. This gets added to its own tab named "Starred Items". note that this required a minor config change. I'm unsure whether this counts as a new config version.

Minor Changes:

• Instead of just saying "Open containing folder" in the context menu it now says "Show file in [File Explorer / Finder / file manager]" depending on OS. You can now also open folders by right clicking them too.
• Added File highlighting when displaying a file from the mentioned option. Aside from Windows and Mac, this works on: nautilus, dolphin, thunar, pcmanfm, nemo, caja, io.elementary.files, spacefm, pcmanfm-qt and any other file manager that supports the --select cli option can easilly be added. note that this falls back to the old system if a compatible file manager can't be found.

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I am very sorry about the huge diff. at some point my IDE decided to use the .clang-format to reformat everything without me noticing.

This has been tested on Linux (manjaro, gnome) only. I will test Windows soon.

I have tried to add screen recordings but for some reason my screen recording software isn't working. I will edit this with recordings when I can