Add customString and customInteger to Unit data model

Introduced customString and customInteger fields to the Unit class in both backend (C++) and frontend (TypeScript/React). Updated data indexes, interfaces, and API handling to support setting and retrieving these custom fields. Also added UI elements in the unit control menu to display and handle these new properties.

backend/core/include/datatypes.h

@@ -72,6 +72,8 @@ namespace DataIndex {
 		airborne,
 		cargoWeight,
 		drawArguments,
+		customString,
+		customInteger,
 		lastIndex,
 		endOfData = 255
 	};

backend/core/include/unit.h

@@ -132,6 +132,8 @@ public:
 	virtual void setAirborne(bool newValue) { updateValue(airborne, newValue, DataIndex::airborne); }
 	virtual void setCargoWeight(double newValue) { updateValue(cargoWeight, newValue, DataIndex::cargoWeight); }
 	virtual void setDrawArguments(vector<DataTypes::DrawArgument> newValue);
+	virtual void setCustomString(string newValue) { updateValue(customString, newValue, DataIndex::customString); }
+	virtual void setCustomInteger(unsigned long newValue) { updateValue(customInteger, newValue, DataIndex::customInteger); }
 
 	/********** Getters **********/
 	virtual string getCategory() { return category; }
@@ -201,6 +203,8 @@ public:
 	virtual bool getAirborne() { return airborne; }
 	virtual double getCargoWeight() { return cargoWeight; }
 	virtual vector<DataTypes::DrawArgument> getDrawArguments() { return drawArguments; }
+	virtual string getCustomString() { return customString; }
+	virtual unsigned long getCustomInteger() { return customInteger; }
 
 protected:
 	unsigned int ID;
@@ -273,6 +277,9 @@ protected:
 	bool airborne = false;
 	double cargoWeight = 0;
 	vector<DataTypes::DrawArgument> drawArguments;
+	
+	string customString = "";
+	unsigned long customInteger = 0;
 
 	/********** Other **********/
 	unsigned int taskCheckCounter = 0;