v0_2_6 Fixes from GUI decoupling
- In CmdCoreAgent, add add_tracker_agent cmd + improve top tracking handling
- In CmdCoreAgent, make add_request thread_safe by adding a lock
- In StateCoreAgent, add method to clear the transition map
- Add flag in AgentFoundation to follow any incoming heartbeat or state update
- in CmdCoreAgent process_heartbeat to follow any incoming heartbeat from yet unknown source (similar to top default)
- in StateCoreAgent rec_dist_states_updates to follow any incoming state update from yet unknown source (similar to top default)
- updates corresponding test test_CmdCoreAgent::test_CmdCoreAgent_process_heartbeat
- Not sure how to test the state side with the current set of tests
- In EcsCoreAgent, fix get_combined_state crash if no subagent at first status update
- Rename BaseCmdAgent test_send_any to send_to_any + fix log and reply usage
- Add some tools info in README