Vuo 0.5.6

This release fixes a critical issue with generic nodes, and a few other issues:

• Fixed Vuo Editor crashes when opening compositions or instantiating generic nodes on some systems (systems where Xcode Command Line Tools was not installed). (Thanks to @cermaerd, @architek1, @bareimage1, and @pixelnoizz for helping us track down this problem!) [#7237]
• Fixed crash that occurred when publishing the input of a drawer, then publishing the input “list” port of the drawer’s host node. [#7243]
• Fixed editor hang after publishing a generic port, specializing the port, and then Undoing. [#7138]
• Fixed Display Scene example composition (its scene filename had been corrupted). [#7240]