[feature] Folder creation capability

[tuancoltech]

• Support folder creation capability.
  Folder creation capability ark-filepicker#5
  Video: https://recordit.co/M9pVoU7eJT

• Pin folders from classical view into Roots tab:
  FilePicker: Pin folders from classical view into "Roots" tab #49
  Video: https://recordit.co/PFTuksgTD8

• Automatically pin a folder (Make Root/Favorite) when creating new folder in Roots tab: [feature] Folder creation capability #41 (comment)
  Video: https://recordit.co/PFTuksgTD8

[kirillt]

Looks good. Let's also enhance this feature in ARK mode ("Roots" tab):

• when a folder is added, it should be immediately displayed in "Roots" tab
• same button is enough: new folder is always either a root, or a favorite

We could also implement this feature in this PR:

• FilePicker: Pin folders from classical view into "Roots" tab #49

[kirillt]

And let's also take #51 in the scope, copying the checklist from there.

General points:

• Switch-off ARK view when there is no .ark-roots file
• Remember the active tab, start with the tab which was active last time

File-picking mode:

• Enable ARK view in file-picking mode
  For this we need to implement one of these:
  • Embed Resource Grid from Navigator
  • Allow selecting a folder and switch back to classical view.

[tuancoltech]

Looks good. Let's also enhance this feature in ARK mode ("Roots" tab):

• when a folder is added, it should be immediately displayed in "Roots" tab
• same button is enough: new folder is always either a root, or a favorite

We could also implement this feature in this PR:

• FilePicker: Pin folders from classical view into "Roots" tab #49

@kirillt Both enhancement in ARK mode and folder pinning from classical view have been implemented. Please check out the demo video in the PR's description.

[tuancoltech]

And let's also take #51 in the scope, copying the checklist from there.

General points:

• Switch-off ARK view when there is no .ark-roots file
• Remember the active tab, start with the tab which was active last time

File-picking mode:

• Enable ARK view in file-picking mode
  For this we need to implement one of these:

  • Embed Resource Grid from Navigator
  • Allow selecting a folder and switch back to classical view.

@kirillt Since the changes in this PR are already large, and the scope of the changes is growing bigger and bigger, I suggest making this enhancement in a separate PR :). I can take care of it.
Thanks.

[tuancoltech]

Add a sample of how to open the picker in FILE mode.

[kirillt]

Great job, thank you