Add new Power Query functions and update settings for improved data handling

power-query/specific/fDummyTable.m

@@ -0,0 +1,8 @@
+(optional LST_DUMMY_DATA as nullable list, 
+ optional LST_COLUMNS    as nullable list) as table => 
+    let
+        DummyColumns = if LST_COLUMNS = null then LST_DUMMY_DATA else LST_COLUMNS,
+        DummyData = if LST_DUMMY_DATA = null then List.Repeat({null}, List.Count(DummyColumns)) else LST_DUMMY_DATA,
+        Dummy = #table(DummyColumns, {DummyData})
+    in
+        Dummy