Imports of package convert

PathSynopsis
fmtPackage fmt implements formatted I/O with functions analogous to C's printf and scanf.
github.com/google/trillian/merkle/smtPackage smt contains the implementation of the sparse Merkle tree logic.
github.com/google/trillian/storage/storagepbPackage storagepb contains protobuf definitions used by various storage implementations.
github.com/google/trillian/storage/treePackage tree defines types that help navigating a tree in storage.