plugin control v0.1.7

• add plugins with the preferred plug-add command
• enable and disable installed plugins directly
• keep plug-install working as a soft compatibility alias
• show lowercase shortcuts that match the keys users press
• show catalog refresh times in a friendlier local format
• highlight active refreshes in yellow and recent success in green
• avoid catalog network refreshes until requested
• offer clear preserve data and delete data removal choices
• keep settings and cached data in stable namespaced paths
• make future updates safer with focused backend and palette modules