Flutter Hot Reload on Save for all devices

[md-weber]

Currently there is no option to hot reload all devices on save, it will only execute hot reload on one device.

It would be great to have the option to choose if I want to hot reload one application or all of them with saving the project.

[stevemessick]

Also see #956.

[md-weber]

I will close this issue because it is already discussed in #956, thanks @stevemessick