Only include Log.cs when KSPBT_ReferenceUnityAssemblies is true (#61)

Author: drewcassidy

CHANGELOG.md

@@ -19,6 +19,7 @@ All notable changes to this project will be documented in this file
   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.
+- Only include Log.cs (or anything else in include/unity) when `KSPBT_ReferenceUnityAssemblies` is `true` (#61)
 
 ### Docs
 

KSPCommon.props

@@ -89,7 +89,9 @@
   <!-- Import solution-wide props if it exists -->
   <Import Condition=" Exists('$(SolutionDir)$(SolutionName).props') " Project="$(SolutionDir)$(SolutionName).props"/>
 
-  <ItemGroup>
-    <Compile Include="$(MSBuildThisFileDirectory)/include/*.cs" Condition="exists('$(MSBuildThisFileDirectory)/include')"/>
+  <ItemGroup Condition=" exists('$(MSBuildThisFileDirectory)/include') " >
+    <Compile
+            Include="$(MSBuildThisFileDirectory)/include/unity/*.cs"
+            Condition=" '$(KSPBT_ReferenceUnityAssemblies)' == 'true' "/>
   </ItemGroup>
 </Project>