Backports for 7.2.0 and update changelog (#838)

* CLN : Remove commented out/dead code (#833)

* Update image license files (#818)

* DEV : Add CC-BY-3.0 license file

and include it in the pyface distribution

	new file:   LICENSE-CC-BY-3.0.txt
	modified:   MANIFEST.in

* DEV : Move license content to main image license file

and delete the now redundant license file

	deleted:    examples/application/python_editor/images/image_LICENSE.txt
	modified:   image_LICENSE.txt

* DEV : Move more license information to top level image license file

	deleted:    examples/application/python_shell/images/image_LICENSE.txt
	modified:   image_LICENSE.txt

* DEV : More more license info into image license file

and remove the duplicate info file

	deleted:    examples/data_view/images/image_LICENSE.txt
	modified:   image_LICENSE.txt

* DEV : More more license info into top level image license file

	deleted:    examples/dock/images/image_LICENSE.txt
	modified:   image_LICENSE.txt

* DEV : More some more license info into top level license file

	deleted:    examples/images/image_LICENSE.txt
	modified:   image_LICENSE.txt

* DEV : Move some more license info into top level image license file

	deleted:    examples/tasks/advanced/images/image_LICENSE.txt
	modified:   image_LICENSE.txt

* DEV : Move more license info into top level image license file

	deleted:    examples/tasks/basic/images/image_LICENSE.txt
	modified:   image_LICENSE.txt

* CLN : Remove redundant license file

	deleted:    examples/workbench/images/image_LICENSE.txt

* CLN : Remove outdated/redundant license file

	deleted:    pyface/action/images/image_LICENSE.txt

* CLN : Remove redundant/outdated image license file

	deleted:    pyface/dock/images/image_LICENSE.txt

* DEV : Move more license info to top level image license file

	modified:   image_LICENSE.txt
	deleted:    pyface/images/image_LICENSE.txt

* DEV : More more license info to top level image license file

	modified:   image_LICENSE.txt
	deleted:    pyface/tests/images/image_LICENSE.txt

* DEV : Move more license info to top level image license file

	modified:   image_LICENSE.txt
	deleted:    pyface/tree/images/image_LICENSE.txt

* CLN : Remove another redundant/unnecessary image license file

	deleted:    pyface/ui/qt4/images/image_LICENSE.txt

* CLN : Remove unnecessary/redundant image license file

	deleted:    pyface/ui/wx/grid/images/image_LICENSE.txt

* DEV : More more license info to top level image license file

	modified:   image_LICENSE.txt
	deleted:    pyface/ui/wx/images/image_LICENSE.txt

* CLN : Remove duplicate information

	modified:   image_LICENSE.txt

* CLN : Remove Enthought-licensed content from image license file

	modified:   image_LICENSE.txt

* Fix loading resource images from a module that is not a package (#836)

* Fix loading resource files from a module that is not a package

* Replace module name with just the module

This is an optimization but is also safer:
importlib_resources will resolve the module name back to the module.

* Change IOError to OSError to be consistent

Since Python 3.3, IOError is simply alias of OSError

* update changelog with relevant backported PR

* Revert "update changelog with relevant backported PR"

This reverts commit 9b3cf77.

Co-authored-by: Poruri Sai Rahul <rporuri@enthought.com>
Co-authored-by: Kit Choi <kitchoi@users.noreply.github.com>

Author: 3 people

LICENSE-CC-BY-3.0.txt

@@ -2,6 +2,7 @@ include image_LICENSE.txt
 include image_LICENSE_Eclipse.txt
 include image_LICENSE_Nuvola.txt
 include image_LICENSE_OOo.txt
+include LICENSE-CC-BY-3.0.txt
 include LICENSE.txt
 include README.rst
 include MANIFEST.in