Make LicenseDetection public and allow choosing license style

[alejandrohdezma]

What has been done in this PR?

• Make LicenseDetection public so it can be used outside of this plugin, by third-party integrations.
• Change LicenseDetection#startYear to String so other values can be used (such as a year range).
• Add LicenseStyle parameter to LicenseDetection.
• Add new headerLicenseStyle setting to HeaderPlugin that LicenseDetection will use by default. It is backward compatible since the default value (Detailed) is also the default value of the different licenses constructors.

[hseeberger]

Thanks!

Could you please explain how the change wrt. LicenseStyle affects usage?

Also, please take a look at the build failure.

[alejandrohdezma]

Could you please explain how the change wrt. LicenseStyle affects usage?

Of course! For users that want to change the license style while still using the auto-detection feature, now they can just select the license style they want to use using the headerLicenseStyle setting.

Also, please take a look at the build failure.

Could you please re-launch the build, the only failures I see are related to failing downloads from maven central, which doesn't occur when running the build locally.

[hseeberger]

Thanks. The build now succeeded. Good job!

Could you please update the documentation in the README wrt the changes.

[alejandrohdezma]

Could you please update the documentation in the README wrt the changes.

Sorry it took so long 😓

Done in 7295d9c

[hseeberger]

Thanks! Nice contribution.

[ches]

This is nice. I just came to the README and followed it, only to find that headerLicenseStyle key doesn't exist—@hseeberger do you have a release planned?

[hseeberger]

@ches not planned, but I'm cutting one right now ;-)