Implement technology tree, research queue by least remaining work, and unit/building tech availability & obsolescence

actionneededmanager.h

@@ -12,7 +12,8 @@ class City;
 enum class ActionNeededType {
     UnitIdle = 0,
     CityNoProduction = 1,
-    CityFreePopulation = 2
+    CityFreePopulation = 2,
+    NoResearch = 3
 };
 
 struct ActionItem {
@@ -33,6 +34,7 @@ struct ActionNeededConfig {
     bool trackIdleUnits = true;
     bool trackCityNoProduction = true;
     bool trackCityFreePopulation = true;
+    bool trackNoResearch = true;
     int maxVisibleItems = 8;
 
     int itemWidth = 155;
@@ -46,6 +48,7 @@ struct ActionNeededConfig {
     QColor unitIdleColor = QColor(60, 160, 255);
     QColor cityNoProdColor = QColor(255, 160, 40);
     QColor cityFreePopColor = QColor(70, 220, 130);
+    QColor noResearchColor = QColor(56, 200, 255);
     QColor cardBgColor = QColor(18, 24, 34);
     int cardBgAlpha = 235;
 };
@@ -59,7 +62,8 @@ public:
 
     void update(float deltaTime, int activePlayerId,
                 const std::vector<std::shared_ptr<Unit>> &units,
-                const std::vector<City> &cities);
+                const std::vector<City> &cities,
+                bool needsResearch = false);
 
     std::vector<ActionItem> getVisibleItems() const;
     int getVisibleCount() const;