net-im/teamwords: Allow to change notification style via WEBKITNOTIFY option

• Drop qt5-x11extras, qt5-svg, qt5-linguist dependencies; use qt5-buildtools for build time only
• Add qt5-webkit and qt5-widgets as explicit runtime dependencies; they were most likely hidden by qt5-linguist previously
• Fix some tabs vs spaces issue
• Reset maintainership due to the long timeout

PR: 209148
Submitted by: avos
Approved by: kmoore (maintainer timeout, ~33 months)