Update versions ready for release

Update docs for ASP.NET Core libraries

Update versions ready for release

Update versions ready for release

Update versions ready for release

Update versions ready for release

Update REST-based libraries to use v1.25

The Google.Cloud.Translation.V2 library adds the dependencies
explicitly so we're not just using the versions GAX depends on. The
others update their service-specific version.

Also updated the Translation library's own version so this can be
released.

Update version of Google.Cloud.Language.V1.Experimental, ready for re…

…lease

Update Speech v1 documentation

Update version numbers for *all* packages

Most packages are just bumped up their existing alpha/beta level.
In addition:

- Google.Cloud.Storage.V1 goes to 1.0.0 (GA)
- Google.Cloud.Datastore.V1 goes to 1.0.0 (GA)
- Google.Cloud.Logging.V2 goes to 1.0.0 (GA)
- Google.Cloud.Logging.Type goes to 1.0.0 (GA)
- Google.Cloud.Translation.V2 goes to 1.0.0-alpha01