Updates cpp 2023

I changed some things (See diff) to kill all the C++ warnings.

lab1/test/code

+/*
+	This test checks the fibonacci function
+	Author: John Tinnerholm
+*/
+declare
+a : integer;
+function fib (x : integer) : integer
+begin
+  if x == 0 then
+    begin
+      return 0;
+    end
+  elseif x == 1 then
+    begin
+      return 1;
+    end
+  else
+    begin
+      return fib(x - 1) + fib(x-2);
+    end
+  if;
+end;
+
+begin
+  a := 0;
+  while a < 10 do
+    begin
+      putint(fib(a));
+      putline();
+      a := a + 1;
+    end
+  while;
+end;