[CMD] Fix missing/misplaced newlines at end of displayed errors and prompts.

ConInString() should display a newline when it encounters the terminating
carriage-return pressed by the user for ending string output.
+ Remove the extra \n hacks in FilePromptYN[A].

Improve outputted strings from DATE and TIME commands.
+ Rename some STRING_***_ERROR defines.

CORE-18489

base/shell/cmd/ren.c

@@ -314,7 +314,7 @@ INT cmd_rename (LPTSTR param)
             else
             {
                 if (!(dwFlags & REN_ERROR))
-                    ConErrResPrintf(STRING_REN_ERROR1, GetLastError());
+                    ConErrResPrintf(STRING_REN_ERROR, GetLastError());
             }
         }
     }