Merge remote-tracking branch 'damfr/save-unique-id' into jgrpp

# Conflicts:
#	src/saveload/afterload.cpp
#	src/saveload/saveload.cpp

src/table/settings.ini

@@ -2848,6 +2848,16 @@ min      = 0
 max      = UINT32_MAX
 cat      = SC_EXPERT
 
+[SDT_VAR]
+base     = GameSettings
+var      = game_creation.generation_unique_id
+type     = SLE_UINT32
+from     = 0
+def      = 0
+min      = 0
+max      = UINT32_MAX
+patxname = ""savegame_unique_id.game_creation.generation_unique_id""
+
 [SDT_VAR]
 base     = GameSettings
 var      = game_creation.tree_placer