Add standard choices, operators, and value fields for conditions.

Review Request #8269 — Created July 6, 2016 and submitted — Latest diff uploaded

Information

Djblets
release-0.10.x
f0d121f...

Reviewers

This introduces a set of standard objects for conditions. These provide
base choice classes for working with strings, integers, and booleans,
along with a set of operators appropriate to each. There are also value
fields designed to properly handle booleans, integers, and strings in a
more convenient way.

Future changes will introduce additional types, such as for dates/times.

Unit tests pass.

Used these operators with some changes for a Review Board extension.