Experimental hack to unify mustache and mustache_template libraries

[xxgreg]

Thanks for keeping the mustache/mustache_template packages going. I haven't had time to do any development on these for a while.

Here's a pull request which isn't intended for merging as-is, rather a proof of concept, to demonstrate an idea, and get feedback. (This is a 1hr hack, and I haven't even tried to run the code).

The idea is to provide a pluggable system for resolving values. And then to provide a separate dart file to import called 'mustache_with_mirrors.dart' which uses a mirrors resolver by default. The existing mustache_template code-path remains the same and does not import mirrors. Doing something like this would allow the same package to support both the mirrors, and non-mirrors approach.

I'm pretty sure there's a better way to do it this, but this was the first thing that came to mind.

Comments appreciated.

Cheers,
Greg.

[jonahwilliams]

Hey @xxgreg , sorry for the lack of response on my end. Github is a bit of a firehose for me and it seems this one slipped through the cracks. I will take a look this week