[NXCM-5131] Set itemMaxAge in a repository resource even if the repository does not have maven-specific artifact/metadataMaxAge
[NXCM-5131] Fix repo REST resource to set itemMaxAge on non-maven repositories for config changes
Add support for getting some repository properties
[NXCM-5131] Add IT for repo creation default values
Update project versions and docs
Add license headers
Build cleanup
Fix @since
Merge pull request #787 from sonatype/nxcm-5131-nuget-config

[NXCM-5131] Fix itemMaxAge settings for non-maven repositories