Drag and drop support

Hello 👋,
I believe that adding support of drag and drop to iSH would be great. Here is how and why: when you work on a file or directory (of a website for example) and you need to compile the code inside the folder; you can simply drag and drop the folder as a ZIP (or possibly another format) on the `TerminalView` and it's getting copied to the current directory on iSH.
Once you've finished, you can drag the folder icon on the bar sitting on top of the keyboard to your other app, and you can continue on the other app.

I think it would make iSH a bit more "desktop-like", as you can already drag and drop on a terminal.