MDL-41228 phpunit: Reset message processors list in unit tests
MDL-40769 usability: new icons for TinyMCE in svg and png formats
MDL-40770 TinyMCE - Implement new icons
MDL-40769 usability: additional icons for TinyMCE in svg and png formats
MDL-40770 TinyMCE - Further changes to implement new icons
MDL-40769 usability: last bit of icons for TinyMCE in svg and png formats
MDL-40770 TinyMCE - Implementing new icons
MDL-41385 usability: new non-default icons for TinyMCE in svg and png formats

Conflicts:

	lib/editor/tinymce/tiny_mce/3.5.8/themes/advanced/skins/moodle/img/delete.png
	lib/editor/tinymce/tiny_mce/3.5.8/themes/advanced/skins/moodle/img/delete.svg
	lib/editor/tinymce/tiny_mce/3.5.8/themes/advanced/skins/moodle/img/spellcheck.png
	lib/editor/tinymce/tiny_mce/3.5.8/themes/advanced/skins/moodle/img/table.png
	lib/editor/tinymce/tiny_mce/3.5.8/themes/advanced/skins/moodle/img/table.svg
MDL-40770 TinyMCE - Final Icon implementation
MDL-37973 gradebook Return a maxgrade of '-' if grade type is TEXT

Including tests for correct return from
grade_edit_tree_column_range->get_item_cell()
MDL-41900 events Log handler failures
MDL-41241 atto: YUIDoc cleanup for link plugin.
MDL-41241 atto: Add a checkbox for open in new window to links
MDL-41227 core_course:fixed up some JS that was confusing activity visibility
MDL-41885 lib: Introduce component_callback_exists

Determines if a callback in a module exists without needing to
call that callback.
MDL-41926 tool_generator: Removing unused vars
MDL-41933 Forum: Make a admin level option to set the default value of Read Tracking.
MDL-40572 badges: Update badge assertion to use new specification
MDL-41894 feedback: Remove unused code, which is generating warnings
MDL-40050 webservice: Replace add_to_log() with new events