Add file and directory download feature

[jgbradley1]

There should be a file/folder download option, either in the File menu or the right-click menu so users can pull files out of the image.

A similar request for a file upload option was made here.

These two features are a nonstarter before I can choose to use code-server over Theia.

[nol166]

This would be super cool. I believe this is on our roadmap but there are some higher priority issues to take care of first.

[deansheather]

If we add download/upload right click context menu buttons, one feature we could add is dragging and dropping files from code-server to your desktop, which is possible apparently.

[achirkin]

Hi, I have an issue with uploading files feature, but I was redirected here from #31 . It looks like the upload feature is not cross-platform enough.
I am hosting code-server on linux;

• Drag-n-drop on a linux machine works like a charm
• On chrome OS it says "Cannot read property 'isFile' of null"
• On windows it tries to copy a file into a path with backslashes instead of normal slashes. I get something like "Cannot copy '/\home\username\bluh-bluh': access denied"

In all three cases I was using chrome on the client side.

[sr229]

This is sadly a upstream issue. Please bring this up on Microsoft/vscode since it concerns them as well. I'll be closing this off now.