Updating metadata for 1.7.5
Fix bad has(ie) checks causing focus issues with Textbox and Editor widgets. Refs #17311.
(cherry picked from commit af80d059f9070bff17e7cbf5c20daa80007d58f0)

Conflicts:
	_editor/RichText.js
	form/TextBox.js
Fix bad has(ie) check in IE11 with older versions of focus.js, which invoked attachEvent. Refs #17311.
(cherry picked from commit 6e032cae2ef959edcd5ee552ba58fdf397fa5ddf)
Fix bad has(ie) check in IE11 with older (1.7) version of _onDijitClickMixin.js, which invoked attachEvent. Refs #17311.
Updating source version to 1.7.6-pre