Process and apply Galileo HAS corrections to the PVT solution

Add getters to Galileo_HAS_data class, improve implementation of existing ones
Process reception of HAS messages and inject corrections to RTKLIB
Apply HAS corrections to PVT computation within RTKLIB
Add configuration parameter PVT.use_has_corrections=true/false, true by default, to deactivate application of corrections but still retrieve HAS messages
Add configuration parameter PVT.use_unhealthy_sats=true/false, false by default, to use observables from satellites flagged as unhealthy
Use an unordered_map for signals and frequencies

src/algorithms/PVT/libs/pvt_conf.h

@@ -92,6 +92,8 @@ public:
     bool dump_mat = true;
     bool log_source_timetag;
     bool use_e6_for_pvt = true;
+    bool use_has_corrections = true;
+    bool use_unhealthy_sats = false;
 };