WIP: Improved patch filtering

[robmen]

• Describe the scenario and benefits that the feature supports.

Pure-WiX patching filtering can work well if the original .wxs code is split into small patch appropriate Fragments. Unfortunately, such Fragments rarely represent a logical grouping of installation functionality. Developers are often surprised that patch filtering happens at the section level rather than logical grouping of Features and Components, etc.

• Describe how you're accomplishing the feature today (if possible).

The Unbinder actually provides a system for logically grouping Rows to be patched by CustomAction, Feature, Component, File, RegistryKey, ODBC, etc. This mechanism matches the typical developer expectations for filtering.

• Describe what you'd like the new feature to do.

Adopt the Unbinder's filtering mechanism instead of the section-based patch filtering found in v3.

[rseanhall]

There is a Burn integration test that needs to be updated with this.

[robmen]

Also, evaluate if this addresses #2689.

[robmen]

The test @rseanhall is referring to is SlipstreamTests.CanAutomaticallyPredetermineSlipstreamPatchesAtBuildTime