Python fluent.runtime - plans

@stas A quick status update - been a bit occupied with other things, but I’ve got a branch for the compiler that I think is ready to review (it’s here in case anything happens to me…)

Before I make a PR though I need https://github.com/projectfluent/python-fluent/pull/92 to be merged/handled first - the error handling strategy affects the compiler branch more than the resolver, and I don’t want to keep going backwards and forwards on this.