callStaticNetworkFunction() and callMemberNetworkFunction() are now template functions instead of macros.
simplified function call interface: always pass five MultiType-references. Check if MultiType.null() evaluates to true to see if the argument was defined.
moved references to NetworkFunctionManager to NetworkFunctionIncludes.cc.
this also fixed a linker error in MSVC by including NetworkFunctionIncludes.h in a build-unit inside the network library.