Fix Avalon-Nuke implementation

[davidlatwe]

Problem

Nuke launched from Avalon will instantly crashed due to some missing function and module-not-found error.

What's changed

• Cleanup a bit so I can launch Nuke without any error.
  • Import toml from avalon.vendor (c78255b)
  • Remove ls_img_sequence (fb4cde5)
• Instead of hard-coded to use pyblish-lite, revert back to use avalon.tools.publish so one can register any pyblish GUI on demand via using pyblish.register_gui in config module. (Also, did not encounter Doesn't work with Nuke pyblish/pyblish-qml#301, even so, no reason to hard code for fix 😌 ) (b668318)

[davidlatwe]

Before I actually step into #438, I need this PR to be merged.

[tokejepsen]

Cant test, but the code good.

[davidlatwe]

For completeness, here's the error message I got while launching before this PR.

NukeX 9.0v7, 64 bit, built Aug 17 2015.
Copyright (c) 2015 The Foundry Visionmongers Ltd.  All Rights Reserved.
Traceback (most recent call last):
  File "C:\Users\david\Dropbox\github\AVALON\avalon-core/setup/nuke/nuke_path/menu.py", line 2, in <
module>
    import avalon.nuke
  File "C:\Users\david\Dropbox\github\AVALON\avalon-core\avalon\nuke\__init__.py", line 7, in <modul
e>
    from .lib import (
  File "C:\Users\david\Dropbox\github\AVALON\avalon-core\avalon\nuke\lib.py", line 6, in <module>
    import toml
ImportError: No module named toml

And Nuke went down.

[BigRoy]

Can't test on my end but the code changes look good to me.

[davidlatwe]

Merging this ! 🚀