v2.2.310: $projectreference navigation

What's Changed

• Add $projectreference search syntax:
  • $projectreference project(My.csproj) - view referenced and referencing projects for a project
  • $projectreference project(My.csproj) Destination - find projects matching 'Destination' and referenced by My.csproj directly or indirectly
  • double-click on a project in results to "center" on it, allowing to navigate the project reference graph in both directions
  • https://github.com/KirillOsenkov/MSBuildStructuredLog/wiki/Search-Syntax#projectreference-search-project-reference-graph
  
• Fix selection background color in Avalonia build by @filipnavara in #799

Full Changelog: v2.2.303...v2.2.310