Save custom mode (#1007)

* first step to save custom game

* localize various settings in custom game

* rename fields to lower cases

* fix many bugs

* fixes #1014

parts/modes/custom_clear.lua

@@ -19,7 +19,21 @@ return {
         end
 
         for _,P in next,PLY_ALIVE do
-            setField(P,1)
+            setField(P,FIELD[1])
         end
     end,
+    savePrivate=function()
+        return {
+            FIELD=FIELD,
+            BAG=BAG,
+            MISSION=MISSION,
+            CUSTOMENV=CUSTOMENV,
+        }
+    end,
+    loadPrivate=function(private)
+        FIELD=private.FIELD
+        BAG=private.BAG
+        MISSION=private.MISSION
+        CUSTOMENV=private.CUSTOMENV
+    end,
 }