Fix dgtest rc file to have translation block. Seems like required by Win7.
Make conditional compilation of dgd::controller static variables
This is required for situations when multiple shared libraries use
dgd, but only single dgd::controller::init() invocation is preferrable.
Add example of an application with single main exe and multiple dlls.
Each component uses dgd, while only main calls dgd::controller::init().

This solution requires instantiated dgd::controller code to be placed in a
separate shared libarary. All other components link with that library.
library.