Simplify TypeScript configuration (updated)

[Akuukis]

Quick work:

• took Simplify TypeScript configuration #996 as a base for working typescript example,
• upgraded from Webpack 3 to Webpack 4 and fixed configs,
• upgraded other dependencies to current newest,
• locked (remove ^) babel dependencies because it's still in beta,
• rebased to new master,
• add support for async & await syntax (EDIT: amended later),
• tested and still working, faster than ever 🎉

Though I should share this. Thanks @lostfictions for heavy lifting!

[codecov-io]

Codecov Report

Merging #1028 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #1028   +/-   ##
=======================================
  Coverage   86.54%   86.54%           
=======================================
  Files          31       31           
  Lines         825      825           
  Branches      193      193           
=======================================
  Hits          714      714           
  Misses         92       92           
  Partials       19       19

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update acb748b...4a0830c. Read the comment docs.

[theKashey]

Looking great, but many people will refuse to use beta babel 7.
Probably one should leave some message about it, as long default package install will bring babel 6.

[Akuukis]

Makes sense. Should we add warning to README and merge, or leave this PR until babel 7 becomes stable?

[theKashey]

I have no idea when it will be done, so lets try just some notes in README

[Akuukis]

@theKashey are we good to proceed?

[theKashey]

All good, sorry just busy a bit in real world.

[theKashey]

I've found that some TS people do not like babel. They could be ok-ish to add babel as a webpack loader, but dont want to replace TS by babel as a whole.
Let me move old readme to a separate file, and point it for all non-babel-7 customers.