Using a global variable to register meta types instead of the main() function.

Prevents needing to have extra includes in the main.

src/pglab/main.cpp

@@ -5,8 +5,6 @@
 #endif
 #include <memory>
 #include "GlobalIoService.h"
-#include "ASyncDBConnection.h"
-#include "Pgsql_Result.h"
 
 int main(int argc, char *argv[])
 {
@@ -24,8 +22,6 @@ int main(int argc, char *argv[])
 	}
 #endif
 
-    qRegisterMetaType<ASyncDBConnection::State>();
-    qRegisterMetaType<Pgsql::ErrorDetails>();
 
 	QApplication a(argc, argv);