Source Generators

[otac0n]

Added source generator support with backwards compatibility. Fixes #14.

You can opt-out of source generation using:

  <UseSourceGeneration>false</UseSourceGeneration>

Or, if you were previously specifying an output path, source generation will be off by default.

[otac0n]

Blocking issues:

• [x] New tests project build fails to load either the MSBuild task (using dotnet build) or the Source Generator (using Visual Studio), although the NuGet package was tested to work.
  • Temporarily disabled these tests. dotnet/roslyn-sdk/issues/1128
• [x] The dependency on System.IO.Abstractions caused a bump to net461, but the payoff has been minimal. It seems not totally worth it to abstract over the filesystem when the only class touching it was the CompileManager. Instead, I think we should roll that back and opt to conditionally compile some static methods.
  • Done
• [x] The analyzer warning RS1035 has been disabled.
  • Temporary in-source suppressions. dotnet/roslyn/issues/71094
• [x] Build error for consuming projects with no WeaveTemplate items.
  • Fixed
• [x] Untested on Linux
  • Integration Tests red-green on Ubuntu
• [x] WeaveAssemblyPath is exposed, but better would be to keep it private.
  • Fixed

Non-blocking issues:

• Double-click on error behavior is not improved, still doesn't take you to the file. This is despite fixing source link issues with relative paths.
• MSBuild Item namespace now includes WeaveTemplateGenerate and WeaveTemplateCompile. I'm considering anything prefixed with WeaveTemplate to be reserved for Weave.

[otac0n]

Failing PR builds here are due to: https://github.com/GitTools/GitVersion/issues/3718