add sfall custom patch file name

src/game.cc

@@ -1348,8 +1348,16 @@ static int gameDbInit()
         return -1;
     }
 
+    // SFALL: custom patch file name.
+    char* patch_filename = nullptr;
+    if (configGetString(&gSfallConfig, SFALL_CONFIG_MISC_KEY, SFALL_CONFIG_PATCH_FILE, &patch_filename)) {
+        if (patch_filename == nullptr || *patch_file_name == '\0') {
+            patch_filename = "patch%03d.dat";
+        }
+    }
+
     for (patch_index = 0; patch_index < 1000; patch_index++) {
-        snprintf(filename, sizeof(filename), "patch%03d.dat", patch_index);
+        snprintf(filename, sizeof(filename), patch_filename, patch_index);
 
         if (compat_access(filename, 0) == 0) {
             dbOpen(filename, 0, NULL, 1);

src/sfall_config.cc

@@ -60,6 +60,7 @@ bool sfallConfigInit(int argc, char** argv)
     configSetInt(&gSfallConfig, SFALL_CONFIG_MISC_KEY, SFALL_CONFIG_AUTO_QUICK_SAVE, 0);
     configSetString(&gSfallConfig, SFALL_CONFIG_MISC_KEY, SFALL_CONFIG_VERSION_STRING, "");
     configSetString(&gSfallConfig, SFALL_CONFIG_MISC_KEY, SFALL_CONFIG_CONFIG_FILE, "");
+    configSetString(&gSfallConfig, SFALL_CONFIG_MISC_KEY, SFALL_CONFIG_PATCH_FILE, "");
 
     configSetString(&gSfallConfig, SFALL_CONFIG_SCRIPTS_KEY, SFALL_CONFIG_INI_CONFIG_FOLDER, "");
     configSetString(&gSfallConfig, SFALL_CONFIG_SCRIPTS_KEY, SFALL_CONFIG_GLOBAL_SCRIPT_PATHS, "");

src/sfall_config.h

@@ -74,6 +74,7 @@ namespace fallout {
 #define SFALL_CONFIG_AUTO_QUICK_SAVE "AutoQuickSave"
 #define SFALL_CONFIG_VERSION_STRING "VersionString"
 #define SFALL_CONFIG_CONFIG_FILE "ConfigFile"
+#define SFALL_CONFIG_PATCH_FILE "PatchFile"
 
 #define SFALL_CONFIG_BURST_MOD_DEFAULT_CENTER_MULTIPLIER 1
 #define SFALL_CONFIG_BURST_MOD_DEFAULT_CENTER_DIVISOR 3