add title and description props and slots for Modal #498
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What does this PR do?
Refactors Modal to allow title and description in header, just like in Pink.
I also opted to allow a prop instead of a slot, while keeping the slot as an option. The prop is autocompletable, unlike the slot, and is much simpler to write than
<svelte:fragment slot="title>. The slot should remain though IMo in cases where you want to add HTML elements rather than just text.This refactors most Modals to use the prop syntax.
Test Plan
Manual
Related PRs and Issues
Based on #479
Have you read the Contributing Guidelines on issues?
Yes