Tooling upgrade

[RobinVdBroeck]

• Updated dependencies
• We use prettier 2.0 now
• Added babel as a preprocessor
• Remove interface/, instead add the logic to the index.html template
• Optimized asset loader (I clearly did not understand async / await for 100% back then :P)

[gitpod-io]

[DreadKnight]

Very nice initiative! Will have to look into the analytics stuff again soon; seems neither code really works while looking in the GA dashboard, only the website GA code registers the visitors somehow, even when the game is embedded in various arcade websites. This is so confusing, sigh 😕

Anyway, regarding the last patch, the index.html file is huge and needs to become a template only, hence why stripping things away from it. There's an open issue #1111 just for that kind of stuff.

[DreadKnight]

@RobinVdBroeck Latest build fails because you changed index extension...

[RobinVdBroeck]

@DreadKnight It's working in Gitpod now

[DreadKnight]

@RobinVdBroeck Had to revert all these as they crash Heroku even though everything worked nicely on Gitpod and currently the beta version of the game is displayed first thing on the website atm...
Please make more concise individual PRs so I can test/merge 1 by 1 or I could grant you access to Heroku or you could set up an account on your own and test out using the autodeploy feature...
Been trying to use Google Cloud but it's super complicated in comparison to Heroku, so no luck yet.
I wonder if I should just host things by dropping the stuff inside the deploy folder in GitHub pages,
but that's a tad tricky as well as the deploy folder is ignored otherwise it would duplicate all assets.
And if using a different repo altogether, it would avoid continuous integration for the beta version.

[DreadKnight]

@RobinVdBroeck I've opened up #1629, #1630 and #1631 to address these issues separately.