Nuke: fix set colorspace with new settings

[create-issue-branch]

Closes #1375

• Fixing the way nuke lib is getting settings data for image properties from Anatomy ImageIO
• Fixing the nuke.api.lib module header self variable name to opnl because it was colliding with WorkfileSettings class and its sub function self variable.
• Implementing forgotten ImageIO Setting's attribute Viewer
• The new required input data attribute creator had to be added into a created OpenPypeData attributes for later use in filtering by a plugin name.

[hound]

Some files could not be reviewed due to errors:

Traceback (most recent call last):

Traceback (most recent call last):
  File "/usr/local/bin/flake8", line 8, in 
    sys.exit(main())
  File "/usr/local/lib/python3.8/dist-packages/flake8/main/cli.py", line 18, in main
    app.run(argv)
  File "/usr/local/lib/python3.8/dist-packages/flake8/main/application.py", line 393, in run
    self._run(argv)
  File "/usr/local/lib/python3.8/dist-packages/flake8/main/application.py", line 381, in _run
    self.run_checks()
  File "/usr/local/lib/python3.8/dist-packages/flake8/main/application.py", line 300, in run_checks
    self.file_checker_manager.run()
  File "/usr/local/lib/python3.8/dist-packages/flake8/checker.py", line 331, in run
    self.run_serial()
  File "/usr/local/lib/python3.8/dist-packages/flake8/checker.py", line 315, in run_serial
    checker.run_checks()
  File "/usr/local/lib/python3.8/dist-packages/flake8/checker.py", line 598, in run_checks
    self.run_ast_checks()
  File "/usr/local/lib/python3.8/dist-packages/flake8/checker.py", line 502, in run_ast_checks
    for (line_number, offset, text, check) in runner:
  File "/usr/local/lib/python3.8/dist-packages/flake8_django/checker.py", line 56, in run
    parser.visit(self.tree)
  File "/usr/lib/python3.8/ast.py", line 363, in visit
    return visitor(node)
  File "/usr/lib/python3.8/ast.py", line 371, in generic_visit
    self.visit(item)
  File "/usr/local/lib/python3.8/dist-packages/flake8_django/checker.py", line 39, in visit_ClassDef
    self.capture_issues_visitor('ClassDef', node)
  File "/usr/local/lib/python3.8/dist-packages/flake8_django/checker.py", line 33, in capture_issues_visitor
    self.generic_visit(node)
  File "/usr/lib/python3.8/ast.py", line 373, in generic_visit
    self.visit(value)
  File "/usr/local/lib/python3.8/dist-packages/flake8_django/checker.py", line 36, in visit_Call
    self.capture_issues_visitor('Call', node)
  File "/usr/local/lib/python3.8/dist-packages/flake8_django/checker.py", line 30, in capture_issues_visitor
    issues = checker.run(node)
  File "/usr/local/lib/python3.8/dist-packages/flake8_django/checkers/render.py", line 22, in run
    if isinstance(arg, ast.Call) and arg.func.id == 'locals':
AttributeError: 'Attribute' object has no attribute 'id'

[mkolar]

Seems to work quite well for me. The only thing I'm not sure about is the callback that should be setting on the launch of nuke, that is not working for me.

[mkolar]

@jezscha shall we deal with the startup setting in a different PR?