Use a trash icon for anything that will remove a widget or a panel
Summary: Like D14116, but for the remaining uses of inappropriate close icons for buttons that will remove widgets or panels. We change those to trash icons to make it clear what will happen.
Reviewers: broulik, Plasma
Reviewed By: broulik, Plasma
Subscribers: gregormi, plasma-devel
Differential Revision: https://phabricator.kde.org/D14138