Highlight files in FileBrowser

[AW1534]

I am redoing #7419 in two smaller steps.

• 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.

I've tested this on windows, and It was working on Linux (Manjaro, GNOME, Nautilus) back when i originally wrote this, and not much has changed since then.

[AW1534]

Turns out my code was fine, its just that without LV2 support, item->isTrack() returns the wrong value. This causes the context menu to always display the options for presets (send to instrument track).

Example


Works fine with the CI Built binaries. I'll be removing some debug code and opening this PR up for review.