Compile-time checked element names

[lukechu10]

Element names should be checked at compile-time for the view! macro. This will be implemented by declaring structs for all possible html tags, e.g.

struct a;
struct button;
struct div;
// etc...

This will also allow the opportunity to have nice ide hover support and hopefully completions for html tags.

For custom elements, the syntax will be slightly changed to force the name to be in quotes, e.g.

view! {
    "my-custom-element" {
        // ...
    }
}

[arctic-hen7]

Do you think it's worth dynamically generating these for the HTML backend with a build script?