Remerge app.py

[mottosso]

#388 mistakenly merged the wrong app.py for the new loader. See #426 (comment)

@davidlatwe At first glance, this appears to be working, however the style doesn't appear to work, and I'm not sure why? :S

Before

After

[mottosso]

These are both running Loader from outside of Maya, e.g.

python -m avalon --loader

[davidlatwe]

I just checked-out your branch. and..
No matter I launcher Loader inside or outside of Maya, all failed to reproduce it 0.0

[davidlatwe]

The only difference (compare to the commit before 388) I spotted was this line, it's from #393 here, the last missing piece.

- assets = AssetWidget()
+ assets = AssetWidget(silo_creatable=False)

[mottosso]

Ok, I can confirm this only happens with PySide2-5.13, and does not happen with..

• PySide
• PySide2-5.12
• PyQt4
• PyQt5-5.12

Very strange, but probably nothing we need to worry about.

[mottosso]

The only difference (compare to the commit before 388) I spotted was this line, it's from #393 here, the last missing piece.

Sorry, missed this. Pushed this directly to master just now.