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feat (audiences): Audience combinations (#175)

This adds support for audience combinations on experiments. If `experiment.audienceConditions` is present, it will be used as a condition tree where the leaf conditions are audience Ids.

- Condition tree evaluation and custom attribute condition evaluation are split into separate modules. Condition tree evaluation accepts a leaf evaluator function argument.

- The audience evaluator uses the condition tree evaluator on both the experiment audience conditions and the individual audience conditions.

- Project config methods are updated to support audience combinations.

`getExperimentAudienceConditions` returns `audienceConditions` if it exists, otherwise it falls back to `audienceIds`.

- The audience evaluator treats conditions trees and flat lists of audience ids (the old format) the same way, because a flat list of audience ids is a valid condition tree with an implicit OR condition.

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