Fixed memory leak on game re-init.
Plugin card header font size tweaks.
Combined summary and general messages cards.

Removed their card item from the sidebar, and added a "Home" icon button
to the top that navigates to their card.

Also added a divider above the content filter to distinguish it from the
tabbed content, and changed the refresh content icon.
Editor header font size fix.
Fixed plugin item drag 'n' drop text.