[Core] New debugger and minor updates

* The debugger has been fully refactored and now contains multiple pages (asset, options)
* Old graph viewer (and all related stuff) have been removed

* All AssetStorageUnits and Assets now know their parent bundle
* All built-in implementations of BundleLoaders have been updated to be able to post process BundleStorageUnits, once loaded using the available strategies
* All implementations of BundleLoaders can now have a custom bundle post-processing
* Fixed logging issue while executing the request handlers

Closes #41