Consider renaming of BlazorTemplater class to different name

[conficient]

Testing the library in an application I found it awkward having the renderer class name the same as the namespace. I wasn't able to add a using for the namespace and then use the BlazorTemplater class. I think it's recommended against in C# guidelines somewhere, so will rename.

Possible alternatives:

• Templater
• Renderer
• RenderHost

Need to:

• [ ] Make breaking change, as 1.1
• [ ] Rename references in the code/tests
• [ ] Amend documentation
• [ ] Amend renderer variable names to templater

[conficient]

Should also change name of vars from renderer to templater in sample code and tests.