Put the gbeandatas in a deployment context in a queriable container and use queries to resolve links

GBeans in a DeploymentContext should be kept in a queriable registry like the BasicGBeanRegistry, but for GBeanData rather thand GBeanInstance. ejb-links, resource-links, gbean-links, etc should be resolved by querying this registry rather than more special purpose tracking. This should simplify RefContext considerably. This feature is needed so that if the mail gbean is deployed in a j2ee module (such as an app client) it can be used in that same module.