[server] Fix a bug when uploading file with client-encryption.
fixed webdav in build-server.py
[http] Fix a bug when download a non-existing block.
[server] Fix a bug in recvfs-proc.

pending_objects should be decreased after the object is written
into disk.
[client] Use old sendcommit-proc to sync old version libraries.
[client] update msi/deb version to 3.0.3
[client] use new login api in seaf-cli