Rework to #1848 RawHTML not being saved

[leigh-pointer]

Restructured the execution of code.
RawHTML now works as it did in previous versions as well as the new functionality.

[sbwalker]

@leigh-pointer the RichTextEditor still has issues with these latest changes. To reproduce the problem, simply install the Oqtane.Blogs module and create a blog entry and then click the Edit button to edit the entry. The following line of code throws an unhandled exception:

        // preserve a copy of the rich text content ( Quill sanitizes content so we need to retrieve it from the editor )
        _original = await interop.GetHtml(_editorElement);

The problem is that _editorElement is null - which happens on a re-render because the logic to set the _editorElement variable is located inside the if firstrender block. I moved the logic above inside the if block (which is where it was located previously) and it resolved the problem.

My concern however is that I was never able to reproduce the original problem which your previous PR for #1837 was attempting to resolve... so I cannot determine if it resolves all scenarios.

[leigh-pointer]

@sbwalker I have had a quick look and moving the code seems to continue to work with my original PR
However the Blog module references

 public override List<Resource> Resources => new List<Resource>()
    {
        new Resource { ResourceType = ResourceType.Stylesheet, Url = "css/quill/quill1.3.6.bubble.css" },
        new Resource { ResourceType = ResourceType.Stylesheet, Url = "css/quill/quill1.3.6.snow.css" }
    };

These resources were removed when Quill was updated to 1.3.7 Update Quill component to latest version #1842 and remove quill 1.3.6 assets #1866

[sbwalker]

Yes I noticed that as well - renaming the CSS resources was a breaking change. The solution going forward is to rename the Quill CSS and JS files so they do not identify a specific version number.