title: Default or specify msbuild properties in an external file
body: <p>Ok, so I have a few dozen solutions all built using the exact same command line.</p>
  
  <p>msbuild SolutionName.sln /p:property1=value1;property2=value2;etc etc etc.</p>
  
  <p>Except the number of properties just grows and grows.</p>
  
  <p>Is there a way to specify an external file some how so I don't end up with a 10 line msbuild command? (Think property 100, property 101, etc).</p>
  
  <p>I'm aware of .wpp.target files. However, having to copy them into each project folder really... is my last resort.</p>
  
  <p>And no, I'm not modifying any default MSBuild targets/files whatsoever.</p>