Alignment of addin lifecycles

Cake Issues has a modular architecture consisting of multiple addins. Historically every addin had its own independent release lifecycle. Starting with the next release work will begin to have all addins share the same release lifecycle.

When Cake Issues started all three core addins (Cake.Issues, Cake.Issues.Reporting and Cake.Issues.PullRequsts) and every issue provider, report format and pull request system addin were released on their own schedule, allowing fast iterations of individual components. With the release of Cake Issues 1.0 the release lifecycle of the three core addins have been aligned, resulting in a simplified release process.

Starting with the next release we'll begin to move also the remaining issue provider, report format and pull request system addins into the main Cake Issues repository and have them released together with the core addins.