Modernize

[Sytten]

• Update all dependencies and removed unused ones (let me know if I missed something)
• Switched tslint back to eslint with proper parser
• Run latest prettier
• Remove rollup and bring the tsconfig closer to library standard
• Add renovate config (will add the bot once merged)
• Add Github action CI (will add the publish and gh-pages one in a subsequent PR)

Typedoc is still broken and I dont understand why, might be due to https://github.com/TypeStrong/typedoc/issues/1493. Might have to revert to per 0.20.