ECollectionBackend: Restore resources from cached key files.
ECollectionBackend: Restore resources from cached key files.

Read all key files in the ECollectionBackend's cache directory during
initialization and create an ESource instance for each for them.  Stash
these ESources in an "unclaimed resources" hash table.  The backend can
claim an ESource by its resource ID (each backend class determines what
a resource ID means exactly), and then add it to the registry server.

All without breaking the public API.  Whoopie!

Distrotech/evolution-data-server,tintou/evolution-data-server,Distrotech/evolution-data-server,tintou/evolution-data-server,tintou/evolution-data-server,tintou/evolution-data-server,matzipan/evolution-data-server,matzipan/evolution-data-server,matzipan/evolution-data-server,Distrotech/evolution-data-server,Distrotech/evolution-data-server,Distrotech/evolution-data-server,matzipan/evolution-data-server,matzipan/evolution-data-server