Remove strange character in the metadata url.
Bug: zero timeout id after removing it.

I don't know why I've never noticed any complain about trying to remove a non
existent id before testing it in gnome 3.12.
Rework workaround to preserve dash visibility when switching workspace.

I was trying to raise the dash actor above the workspaceSwitcherPopup to
prevent it from stealing the focus and making a mess of the hover status. Now I
just ignore hover change when the worspaceSwitcherPopup exists.

The previous method seemed not to work always in recent gnome-shell versions.
Use gjs classes.

Just to update to the more recent syntax... no benefits I think.
Remove Bolt extension compatibility support code.

As the Bolt extensions is not going to be updated for new version of Gnome
Shell, I'm dropping the compaitibility code for it.
MyDash: bug, forget to update reference to the class in the upstrem file.