Add overlay to flash cards, add a debug window for statistics

Toki Trainer.xcodeproj/xcuserdata/averyadapace.xcuserdatad/xcdebugger/Breakpoints_v2.xcbkptlist

@@ -14,10 +14,10 @@
             filePath = "Toki Trainer/Views/FlashCardView.swift"
             startingColumnNumber = "9223372036854775807"
             endingColumnNumber = "9223372036854775807"
-            startingLineNumber = "194"
-            endingLineNumber = "194"
-            landmarkName = "CardFlipModifier"
-            landmarkType = "14">
+            startingLineNumber = "223"
+            endingLineNumber = "223"
+            landmarkName = "init(isFaceDown:frontText:backText:)"
+            landmarkType = "7">
          </BreakpointContent>
       </BreakpointProxy>
    </Breakpoints>