Migrate to modern stack, including TS, new linting, updated APIs

[janishutz]

What's new

• Migrated to TS
• All methods feature full JSDoc documentation
• Add new APIs with Promise and other modern JS features
• Test have been updated to work with the new APIs too
• Updated ESLint config that also does code formatting

Why

I have used this project before, but only browser based, where the current stack was good enough, but now that I am using this project for a web-app with a bundler, where I like to use NPM packages, it simply wasn't enough any more.

[janishutz]

Alright, I have finished this. I haven't bothered implementing tests for the new APIs, as they are the same as the old ones, but simply using modern browser APIs.

[janishutz]

@lokesh Sorry for the large PR. It's a lot of changes in the package-lock.json and the built files

[janishutz]

I would also like to suggest adding the wiki feature of GitHub. You can let me know when it is up, I can edit the Wiki for you and create docs. Alternatively, I could write some docs as a website

[janishutz]

I might just publish my own version of this to npm, so both versions exist

[janishutz]

I did publish my own package. npm i @janishutz/color-thief

[challet]

I did publish my own package. npm i @janishutz/color-thief

Your package is actually @janishutz/colorthief ;)

[janishutz]

Ohh right... thanks for pointing this out!