Load favorites from local servers

ParaView now provides a way to load all favorites accessible from any local server. This option can be enable with the Load All Favorites in the General section in the Settings.

A small non retro-compatible change has been made in pqFileDialog::pqFileDialogFavoriteModelFileInfo to be able to store the Origin. It's necessary as we want to be able to modify an existing favorite from where it's located even when Lod All Favorites is enabled.