Release 2.4.0

branch

• add support of weather items
• add support of load average (la1, la5, la15 tags)
• add "drop key cache" button
• add support of clang building
• create ExtItems aggregator
• add time to debug information
• add ability to disable player monitor
• fix bug with invalid network data calculation
• fix warning with fond dialog init
• fix bug with no object deletions (#60)
• rewrite ExtItems to use own abstract class
• improve work with data updating (#57)
• move to signal-slot interface painting
• move plugin part back to private
• cast plugin as type, not signleton (#57)
• change logic in data building inside DataEngine
• edit build and drop different DataEngine packaging
• rewrite QMap to QHash if possible
• rewrite to use iterators if possible
• list of desktops is now represented as QStringList
• refactoring