This PR add the support of a flying Avatar per Avatar Bookmark.
Instead to have a flying avatar defined for all avatar and all the time,
this version will let you define a flying avatar for each bookmark where you need one.
You can then have also some avatar without flying avatar linked to it if you want.
or have very different flying avatar depending the avatar used.
If we quit or crash or reload, if the fly avatar was used, the system keep it in its setting.
So when we start, it bring the fly avatar when it was supposed to be the original.
This fix addresses that.
Fly Avatar
This application replaces your avatar for a specific one when you are flying. It reverts automatically the original avatar as soon as you land.
