v2: refactor JSX handler attributes

[wmertens]

See QwikDev/qwik-evolution#316

BREAKING: onCustom-Event now listens for custom-event, not customEvent. Instead, there's on-CustomEvent, you add - after on and it becomes case sensitive.

improvements: less translations between jsx and vnodes, sane event capitalization

fixes:

• event merging with case differences
• window and document event triggering on CSR
• inline component templates with useOn

[changeset-bot]

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Latest commit: 61208e1

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commit: 61208e1