Make KReport use resource files for icons
Summary:
- use kreport_THEME.rcc for library-global icons
- use URL_THEME.rcc for plugin icons with prefix :/icons/URL so there is little risk of conflicts
- use consistent kreport-foo-bar icon naming
- make it easy to add new icons and plugins via cmake
- make plugin files more unique (org.kde.kreport. prefix), helps in co-installation
- make KReportExample work with the changes
Reviewers: piggz
Subscribers: Kexi-Devel-list
Tags: KReport
Differential Revision: https://phabricator.kde.org/D2860