LBCLASSIC-68

The c.q.l.core.util.Loader class is used to load classes or locate resources. 
Previously, the TCCL (Thread Context Class Loader) was used to locate resources,
in particular configuration files. However, the TCCL is not set in all environments. 

Instead of using the TCL use now use the class loader that loaded the Loader class
itself to load resources. Now, under many circumstances TCCL==self classloader
so most users will not see a difference. The situation where TCCL != self cl
can occur under relatively complicated scenarios. Thus, this commit simplifies the code
without hopefully affecting existing deployments.