Remove `module_from_template`

[Archmonger]

Current Situation

module_from_template is currently deprecated, and is due for removal. This is a result of random functional issues caused by unpinned ReactJS versions.

Proposed Actions

Remove module_from_template in a future release of reactpy.

[Archmonger]

We should do this ASAP

[rmorshea]

This would necessitate a 2.0 release though. It seems like there are other things we might want to break if we're going to do that.

[Archmonger]

How about this and #993 for 2.0?

That's our two big breaking changes.

3.0 can be the new JS interface.

[Archmonger]

Resolved in #1251