using launchpad for deployment instead of maven

[kidiyoor]

• all proxies can be found in /gateway dir, all proxy code is within single proxy folder.
• node modules folder forf few proxies which were separate before, now inside the same proxy folder
• deleted /fhir/proxies and /identityandoauth/proxies hierarchy
• few/lot of the policy files very touched to make use of launchpad(config.yml) to replace variables during deployment, however no functional changes have been done. package.json files are also touched, {{ variable_name }} this kind if syntax is used inside policies and package.json files.
• java resource moved to /src/gateway/java folder