Allow drag-and-drop of project files

[tresf]

As the title suggests, it may be intuitive to a user to be able to drag a project file into the Song Editor like most other items are, rather than double-clicking it.

[Spekular]

@tresf Would you consider this something that could be part of the drag n
drop/touch enhancements consolidation issue? I haven't had the time to go
through github and check the other issues yet, but i should be able to soon.

[tresf]

I'm not sure what this has to do with touch? It could go towards general usability, but it is likely a pretty quick fix that could be targeted at 1.2.

[Spekular]

@tresf hasn't this been implemented?

[tresf]

Was waiting for #1671, which has since been merged. Closing.
👍

[curlymorphic]

Looks like i tagged the incorrect issue on the pull request, edited now. #1643 was closed because of my error and needs reopening, sorry about that.

[tresf]

#1643 was closed

Reopened. Thanks for the attention to detail, that would have slipped through the cracks.