The WP component loader API has changed to be asynchronous, so implement a (GAsyncReadyCallback)-based loader to manage them. Logging integration change was required for 0.5.0 RCs but not for the 0.5.0 release.
Fix clang-tidy and clang-format warnings. Note these are significantly wider than the changes for 0.5.0 so optional beyond the existing patchset.