Also introduce adapt_to_string to help with the several to_string overload pairs.

Resolves microsoft/vcpkg#10812

Drive by fix debug printing claiming that telemetry was not a string and that malformed git commit shas were not strings.

…SPDX processing.

… building a package never prints usage.

…eady installed' message, --head warning, and merging the 'green success' message into the total elapsed time part.

…nstalled in this invocation are printed, and a separate license-report command that prints all information known in the installed tree.

# Conflicts:
#	azure-pipelines/end-to-end-tests-dir/build-test-ports.ps1
#	azure-pipelines/end-to-end-tests-dir/ci-verify-versions.ps1

# Conflicts:
#	include/vcpkg/base/contractual-constants.h
#	include/vcpkg/statusparagraph.h
#	src/vcpkg/spdx.cpp
#	src/vcpkg/statusparagraph.cpp

# Conflicts:
#	include/vcpkg/base/contractual-constants.h
#	include/vcpkg/base/message-data.inc.h
#	include/vcpkg/spdx.h
#	include/vcpkg/statusparagraph.h
#	src/vcpkg-test/statusparagraphs.cpp
#	src/vcpkg/commands.install.cpp
#	src/vcpkg/commands.set-installed.cpp
#	src/vcpkg/spdx.cpp
#	src/vcpkg/statusparagraph.cpp