Code style adjustments

[ricardoboss]

I'd like to propose some adjustments to the .editorconfig. They are in no-way final and are meant as a discussion-starter.

This PR is also open to new suggestions for the code style.

Summary of changes:

• Prefer var syntax everywhere (*.cs, *.razor)

[chucker]

I don't have strong opinions here, but:

• I weakly disagree with csharp_style_var_for_built_in_types = true. I think int x = 5; reads better than var x = 5;. I do acknowledge that the alignment is better, though.
• I agree with csharp_style_var_when_type_is_apparent = true.
• I strongly disagree with csharp_style_var_elsewhere = true, at least given MS's awful example: var f = this.Init();. (Of course, part of the problem there is that the method is poorly named.)

In addition, I prefer the first style here, not the second:

    [Parameter]
    public required SyntaxStyle SyntaxStyle { get; set; }

    [Parameter] public required SyntaxStyle SyntaxStyle { get; set; }

[ricardoboss]

[...] In addition, I prefer the first style here, not the second:

    [Parameter]
    public required SyntaxStyle SyntaxStyle { get; set; }

    [Parameter] public required SyntaxStyle SyntaxStyle { get; set; }

There exists a resharper editorconfig rule for this. I don't know it of the top of my head but I will look for it.