Support for unescaped project item includes in templates

[dgrunwald]

SD-1305, originally created on 2/5/2007 12:46:49 by Matt Ward

I was trying to create a WiX project template that has a reference to
the standard WiX UI library. This is done in the .wixproj via:

 
   
 

Note that here I want to use the SharpDevelopBinPath instead of a full
path so the project will build wherever it is located. Unfortunately
there's no support for unescaped ProjectItems in the template:

       
           
        

Here I have added an escapeValue property to the ProjectItems. Not sure
if we need to allow it on individual items. By default the $( ) bit is
encoded so the project no longer builds after the project is created
from the template.