Missing support for "open with" and file association

[fstasi]

Motivation

We need to provide file associations between .ino files and IDE2.

This involves implementing the following behaviours:

• associate a file type (namely, .ino files)
• allow the drag and drop of a file over the icon (macOS only) and open the relevant files

Related

• macOS, cannot open a file directly from Finder #72
• Unexpected behaviour of "Open with....Arduino IDE" #370
• https://forum.arduino.cc/t/file-open-with-right-mouse-key-does-not-work/856111
• https://forum.arduino.cc/t/incorrect-ino-file-loaded/879801
• https://forum.arduino.cc/t/beta-10-and-prior-wont-load-a-script-via-file-explorer-open-with/894968
• https://forum.arduino.cc/t/how-do-i-set-ide-2-0/897607
• https://forum.arduino.cc/t/arduino-2-0-problem/902476
• https://forum.arduino.cc/t/opening-sketch-in-file-explorer-doesnt-work/904514

[fstasi]

assigned to Mark

[per1234]

Closing as duplicate of #72 and #370