This is a working (all tests passing) implementation of the two-phase
compilation system we will need for component discovery.
This builds on top of work we've doing in Razor, including the Razor
SDK, MSBuild tasks, and CLI/server.
This currently *does* discovery components during the build process, but
it doesn't use that data for anything yet.
It works like this:
1. Generate class declarations (structure only, no method bodies)
2. Compile a 'temp' assembly using the .cs files and output of 1.
3. Do component discovery using the 'temp' assembly
4. Generate class definitions (including method bodies)
5. Compile the 'real' assembly using the .cs files and output of 4.
Adds a little more use of Razor extensibility.
Razor is a plugin model, so we can't be the 'first mover' for initiating
compilation in the build tools and IDE.
Reorganizes tests and fills out more reusable test infrastructure for
Razor-driven testing.
Adds tests for declaration-only configuration.
Ryan Nowak