DarkIcons: remove old regex and case sensitive icons and update NOTICE

NOTICE.txt

@@ -1202,7 +1202,6 @@ spyder/images/genprefs.png
 spyder/images/help.png
 spyder/images/italic.png
 spyder/images/pythonpath_mgr.png
-spyder/images/upper_lower.png
 spyder/images/vcs_browse.png
 spyder/images/vcs_commit.png
 spyder/images/actions/1downarrow.png
@@ -1606,37 +1605,6 @@ spyder/images/winpython.svg
 -------------------------------------------------------------------------------
 
 
-
-OOjs UI MediaWiki lib
----------------------
-
-
-Copyright (c) 2011-2018 OOUI Team and other contributors.
-
-
-Authors: OOUI Team and other contributors
-https://phabricator.wikimedia.org/diffusion/GOJU/browse/master/AUTHORS.txt
-Source: https://phabricator.wikimedia.org/diffusion/GVED/browse/master/lib/oojs-ui/themes/mediawiki/images/icons/
-Download: https://commons.wikimedia.org/wiki/File:OOjs_UI_icon_regular-expression.svg
-License: MIT (Expat) License | https://opensource.org/licenses/MIT
-
-Modifications made: Removed parentheses, make it bigger.
-
-
-Licensed under the terms of the MIT License.
-
-
-See below for the full text of the MIT (Expat) License.
-
-The current OOjs UI MediaWiki lib repo license can be viewed at:
-https://phabricator.wikimedia.org/diffusion/GOJU/browse/master/LICENSE-MIT
-
-
-Files covered:
-
-spyder/images/regexp.svg
-
-
 ===============================================================================