Review all public API for 0.3.0

[nurupo]

I found in IRC logs that porting TES API to use APIDSL was an API breaking change at some point in late 2016, so I guess we settled on #310 which didn't break anything (or did it? I didn't check), leaving the breaking changes for 0.2.0.

In any case, it makes sense to review all public API before 0.2.0 just in case we want to change something.

[iphydf]

We weren't ready for 0.2.0, but now it's too late to back out the API changes, so we won't get any more breakages in for now. Deferring to 0.3.0.