v5.5.0

Main Changes to previous release version:

Interface changes：

• Carrier:
  • remove Carrier.getInstance();
  • remove Carrier.initializeInstance(options, handler);
  • Create the Carrier instance and return it，using Carrier.createInstance(options, handler);
• Group:
  • Replace carrier.newGroup(groupHandler) with carrier.newGroup();
• Session/FileTransfer Manager:
  • remove Manager.initializeInstance(carrier) and Manager.initializeInstance(carrier, handler);
  • remove Manager.getInstance();
  • Create the Manager instance and return it，using Manager.createInstance(carrier) or Manager.createInstance(carrier, handler);

Other changes:

• Be able to create multiple carrier instances now, which required by Trinity (or elastOS). General application over Carrier network should still keep using singleton carrier instance under application context.
• All groups in Carrier context updated to share one GroupHandler, and become part of CarrierHandler .

Native carrier lib changes:

• Correct default port value for IPFS node service.
• Fix cmake typo.
• Update cygwin.
• Allow ela_get_groups() to be called in the whole lifecycle of carrier due to introduction of persistent group.