Context

This PR is a major refactoring of request matchers.
It introduces several breaking changes and should only be merged on a (future) 2.0 branch.

I tried to address a problem I faced with some advanced usage. Consider this:

• I want PHP-VCR to handle requests to "http://example.com/product?id=**xxx**" (I don't want to use the query_string matcher)
• Except, I want PHP-VCR to return a different response for "http://example.com/product?id=42". For this specific query string, I want to match on the query string.

In v1, the only way to do this is to create a custom request matcher that fulfills all these rules. Furthermore, some third party libraries (like the Symfony bundle) do not offer an easy way to add custom request matchers.

What has been done

This PR makes 2 major changes:

• Request matchers are now objects implementing the RequestMatcherInterface rather than simple callbacks (this is for type safety)
• Request matchers are stored in the cassette

By storing request matchers in the cassette, I can easily use different request matchers on different requests. This makes it easy to develop cassettes with advanced matching logic without going through the hassle of developing a custom request matcher.

Note

This PR is built on top of #259. While #259 does not introduce BC changes, this one is introducing (small) BC changes. DO NOT MERGE on v1 branch!