We can now theoretically use this for any textarea
that supports our markdown (besides the compose box),
plus we keep the RTL code a bit more self-contained.
This commit prepares the frontend code to be consumed by webpack.
It is a hack: In theory, modules should be declaring and importing the
modules they depend on and the globals they expose directly.
However, that requires significant per-module work, which we don't
really want to block moving our toolchain to webpack on.
So we expose the modules by setting window.varName = varName; as
needed in the js files.
Shayan Toqraee
Steve Howell
Armaan Ahluwalia
Tim Abbott