feat: add config setting for QoL improvement in generation

include/GrassControl/Config.h

@@ -36,6 +36,7 @@ namespace GrassControl
 		static inline int DynDOLODGrassMode = 0;
 		static inline int MaxFailures = 2;
 		static inline bool FreezeCheck = true;
+		static inline bool Updating = true;
 
 		constexpr static inline std::string_view iniPath = "Data/SKSE/Plugins/GrassControl.ini";
 	};

src/Config.cpp

@@ -128,6 +128,7 @@ namespace GrassControl
 		ini.SetLongValue("GrassConfig", "DynDOLOD-Grass-Mode", DynDOLODGrassMode, ";Enable grass compatibility mode with DynDOLOD Grass LODs. Valid values: 0 = Disabled; 1 = Display grass only in active cells(without fade) and let DynDOLOD handle inactive cell Grass; 2 = Display grass only in active cells and large ref loaded cells(without fade) and let DynDOLOD handle grass outside of large ref cells ");
 		ini.SetLongValue("GrassConfig", "Max-Failures", MaxFailures, ";Maximum number of attempts to generate a grass cache before skipping a cell.");
 		ini.SetBoolValue("GrassConfig", "Freeze-check-enabled", FreezeCheck, ";Enable or disable the freeze check that is run while generating a grass cache. Recommended to leave enabled unless the message repeately appears.");
+		ini.SetBoolValue("GrassConfig", "Updating-Cache", Updating, ";If you are generating a cache for a worldspace you have not generated yet, set this true. Otherwise, the cache files in your grass folder will be deleted. If you are updating a worldspace, then move all files you do not want to be deleted to a new folder and replace the old files in the folder once you have generated new cache files. Then rename/move the folder back.");
 
 		ini.SaveFile(iniPath.data());
 

src/GidFileCache.cpp

@@ -409,9 +409,11 @@ namespace GrassControl
 				create_directories(dir);
 			}
 
-			for (const auto& entry : std::filesystem::directory_iterator(dir)) {
-				if (entry.path().extension() == ".dgid" || entry.path().extension() == ".cgid" || entry.path().extension() == ".fail") {
-					remove(entry.path());
+			if (!Config::Updating) {
+				for (const auto& entry : std::filesystem::directory_iterator(dir)) {
+					if (entry.path().extension() == ".dgid" || entry.path().extension() == ".cgid" || entry.path().extension() == ".fail") {
+						remove(entry.path());
+					}
 				}
 			}
 		}