Solax freeze modes (#3152)

* Solax freeze modes

* Fixes

* Clean attempt

Author: springfall2008

apps/predbat/config.py

@@ -1904,10 +1904,10 @@
         "clock_time_format": "%Y-%m-%d %H:%M:%S",
         "write_and_poll_sleep": 2,
         "has_time_window": False,
-        "support_charge_freeze": False,
-        "support_discharge_freeze": False,
+        "support_charge_freeze": True,
+        "support_discharge_freeze": True,
         "has_idle_time": False,
-        "can_span_midnight": False,
+        "can_span_midnight": True,
         "charge_discharge_with_rate": False,
         "target_soc_used_for_discharge": True,
     },