Feature: Allow GameScripts to add additional text to Industry view window

src/industry.h

@@ -33,6 +33,13 @@ enum ProductionLevels {
 	PRODLEVEL_MAXIMUM = 0x80,  ///< the industry is running at full speed
 };
 
+enum class IndustryAction : byte {
+	SetControlFlags = 0,       ///< Set IndustryControlFlags
+	SetExclusiveSupplier = 1,  ///< Set exclusive supplier
+	SetExclusiveConsumer = 2,  ///< Set exclusive consumer
+	SetText = 3,               ///< Set additional text
+};
+
 /**
  * Flags to control/override the behaviour of an industry.
  * These flags are controlled by game scripts.
@@ -91,6 +98,7 @@ struct Industry : IndustryPool::PoolItem<&_industry_pool> {
 	byte selected_layout;          ///< Which tile layout was used when creating the industry
 	Owner exclusive_supplier;      ///< Which company has exclusive rights to deliver cargo (INVALID_OWNER = anyone)
 	Owner exclusive_consumer;      ///< Which company has exclusive rights to take cargo (INVALID_OWNER = anyone)
+	std::string text;              ///< General text with additional information.
 
 	uint16 random;                 ///< Random value used for randomisation of all kinds of things