This is a breaking change (so the version would change to 0.1.0 or even 1.0.0).

Docs build for this branch: https://kspbuildtools.readthedocs.io/en/msbuild-refactor/

The goals here were:

• eliminating the double-import of the .csproj.user file. Instead, this branch means that the path to KSP root never gets referenced in the user .csproj at all, allowing all the path determination to be calculated at runtime
• eliminating risk of namespace-collision with other frameworks for property names
• allowing toggling each component of KSPBT, to account for weird use cases, such as...
• allowing building mods for use in the Unity editor, such as UI code, by automatically disabling all the references that are unsafe there. Its up to the mod developer still to set up preprocessor directives and includes to allow compilation in this situation, but it eliminates any need for keeping code the same between the main mod codebase and "stub" cs files just to get serialization working

Changelog:

• Renamed global msbuild properties to have the KSPBT_ prefix to avoid namespace collisions with other frameworks
  • KSPRoot is now KSPBT_GameRoot. It should no longer be referenced within a .csproj file
  • RepoRootPath is now KSPBT_ModRoot, and should now point to the mod folder within GameData rather than the
    root of a git repo
  • BinariesOutputRelativePath is now KSPBT_ModPluginFolder
  • GenerateKSPAssemblyAttribute is now KSPBT_GenerateAssemblyAttribute and defaults to true
  • GenerateKSPAssemblyDependencyAttributes is now KSPBT_GenerateDependencyAttributes and defaults to true
  • ReferenceUnityAssemblies is now KSPBT_ReferenceUnityAssemblies
  • ReferenceKSPAssemblies is now KSPBT_ReferenceGameAssemblies
• Added the KSPBT_ReferenceSystemAssemblies property to control referencing the mono system DLLs within the KSP
  managed folder. Setting this property to false will load the implicit framework DLLs instead.
• Mod dependencies should now be declared with
  ModReference items. This avoids the need for the KSP install path to be known at evaluation time.