More dependency movement from zpl, incremental design improvements.

Made token_fmt more ergonomic, going to have to use a similar behavior with the upfront body constructors.

gencpp.vcxproj.filters

@@ -50,7 +50,7 @@
     <ClInclude Include="thirdparty\zpl.h">
       <Filter>Header Files</Filter>
     </ClInclude>
-    <ClInclude Include="test\NonParsed\Sanity.hpp">
+    <ClInclude Include="test\Upfront\Sanity.hpp">
       <Filter>Header Files</Filter>
     </ClInclude>
   </ItemGroup>