Implement global data store to handle all invert total values

Use the new values in the LED, MQTT and Web interface.

include/Datastore.h

@@ -0,0 +1,61 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+#pragma once
+
+#include <TimeoutHelper.h>
+
+class DatastoreClass {
+public:
+    DatastoreClass();
+    void init();
+    void loop();
+
+    // Sum of yield total of all enabled inverters, a inverter which is just disabled at night is also included
+    float totalAcYieldTotalEnabled = 0;
+
+    // Sum of yield day of all enabled inverters, a inverter which is just disabled at night is also included
+    float totalAcYieldDayEnabled = 0;
+
+    // Sum of total AC power of all enabled inverters
+    float totalAcPowerEnabled = 0;
+
+    // Sum of total DC power of all enabled inverters
+    float totalDcPowerEnabled = 0;
+
+    // Sum of total DC power of all enabled inverters with maxStringPower set
+    float totalDcPowerIrradiation = 0;
+
+    // Sum of total installed irradiation of all enabled inverters
+    float totalDcIrradiationInstalled = 0;
+
+    // Percentage (1-100) of total irradiation
+    float totalDcIrradiation = 0;
+
+    // Amount of relevant digits for yield total
+    unsigned int totalAcYieldTotalDigits = 0;
+
+    // Amount of relevant digits for yield total
+    unsigned int totalAcYieldDayDigits = 0;
+
+    // Amount of relevant digits for AC power
+    unsigned int totalAcPowerDigits = 0;
+
+    // Amount of relevant digits for DC power
+    unsigned int totalDcPowerDigits = 0;
+
+    // True, if at least one inverter is reachable
+    bool isAtLeastOneReachable = false;
+
+    // True if at least one inverter is producing
+    bool isAtLeastOneProducing = false;
+
+    // True if all enabled inverters are producing
+    bool isAllEnabledProducing = false;
+
+    // True if all enabled inverters are reachable
+    bool isAllEnabledReachable = false;
+
+private:
+    TimeoutHelper _updateTimeout;
+};
+
+extern DatastoreClass Datastore;