GitLab Support

I’ve finally been able to add support for GitLab in the GitHub Updater v4.5.0. Additionally, support for GitLab CE and GitLab Enterprise are also included. All that’s required is an additional header with the base URI for the GitLab server. As an example, GitLab CE: https://gitlab.example.com or GitLab Enterprise: https://gitlab.example.com.

Extras for GitHub

Support for GitHub Enterprise is also included using a similar header, GitHub Enterprise: https://github.example.com.
Support for updating from GitHub assets is also included if an asset exists for a tagged release. It will be preferentially used for the update. Using an asset’s URI for the remote installation of a plugin or theme will also function as expected.

Under the Hood

A bit of refactoring has been done as well. An abstract class API has been created to simplify the structure of all the git server API classes. Additionally a class Messages has been created to hold admin notices.
The class Base has been refactored to hold information regarding the added APIs in static arrays for use throughout the codebase.
I hope everyone likes the changes and updates. As always, if there are problems or improvements, please create an issue on GitHub.
Thanks.