Switch to Module Pattern (replace Twig global)

[PolyPik]

@RobLoach

Each of the files simply serve to build up the Twig god object.

What was the rationale behind this design? God objects are considered to be an anti-pattern.

[RobLoach]

God is an anti-pattern :smiling_imp:

Likely legacy, for allowing acting on a global through the web browser. Packages like Browserify and webpack can fix that pattern for us. Would be good to switch to ES6 modules across all the files.

[PolyPik]

There were mentions of a 2.0.0 release in other topics and PRs. The 2.0.0 release should breakup the global object into modules as part of the changes, would you agree?

[RobLoach]

We can wait on a 2.x for this, yes.