Add animation speed slider in general tab, always collapse activeWindow

GeneralTab: add animation speed slider
Workspace: set activeWindow to always collapsed except for hover
Misc: replaced a lot of animations with Style.animationXYZ

Commons/Settings.qml

@@ -140,6 +140,8 @@ Singleton {
         property bool dimDesktop: false
         property bool showScreenCorners: false
         property real radiusRatio: 1.0
+        // Animation speed multiplier (0.1x - 2.0x)
+        property real animationSpeed: 1.0
         // Replace sidepanel toggle with distro logo (shown in bar and/or side panel)
         property bool useDistroLogoForSidepanel: false
       }