Imports of 4-search command

PathSynopsis
fmtPackage fmt implements formatted I/O with functions analogous to C's printf and scanf.
github.com/spdx/tools-golang/idsearcherPackage idsearcher is used to search for short-form IDs in files within a directory, and to build an SPDX Document containing those license findings.
github.com/spdx/tools-golang/tagvaluePackage tvloader is used to load and parse SPDX tag-value documents into tools-golang data structures.
osPackage os provides a platform-independent interface to operating system functionality.