Provides a default implementation of the RV commands used to set up "Get File"
connections between two users. This feature, also known as "Get Files" and
"File Sharing," allows a user to specify files that other users can browse and
download remotely.
@see net.kano.joscar.rvproto.ft
@see net.kano.joscar.snaccmd.CapabilityBlock#BLOCK_FILE_GET