Allow Custom Elements to be self-closing. about svelte HOT 3 CLOSED

AFAIK custom elements can't be made void or self-closing, so I think it's better if they behaved consistently and required the closing tag.

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@CaptainCodeman did you read the linked issue on the Web Incubator Community Group? (WICG/webcomponents#624)

There is an overwhelming support for self-closing web component tags from the community (with regular xml semantics), and an equally overwhelming reluctance to change parser semantics from the browser makers. Based on the history of parser evolution I fully understand the browser makers, however, .svelte files are not legal html and as such have opportunities for improving DX that the browser makers do not have.

Legal html would still be paste-able into .svelte files (and legal svelte have never been paste-able into .html files. This issue would not change that.

Svelte components must be imported and can be self-closing, this would only extend that to Web Components, thus making the syntax more consistent.

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It's better to be consistent here. Either we could've kept it as before and allow self-closing for all elements (we changed that), or we warn on all to align with the spec. Having a weird middle ground would confuse both sides. Therefore closing.

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