Merge branch 'release-0.21'
Merge branch 'develop'
Merge branch 'release'
Merge branch 'release'
Merge branch 'release'
Merge branch 'release'
Merge branch 'release'
Merge branch 'release-0.22' into release
Merge branch 'release-0.22'
Merge branch 'check-pkg_config-by-conditional' into build
Bump version
Merge branch 'configure' into release-0.22
Merge branch 'release-0.22' into release
Merge branch 'configure' into release-0.22
Merge branch 'release-0.22' into release
Merge branch 'configure' into release-0.22
Merge branch 'release-0.22' into release
Merge branch 'release' into develop
Merge branch 'release'
Update some LICENSE files