loveutils: add back the wrap function

sonic-boost.love/libs/loveutils/math.lua

@@ -1,5 +1,21 @@
 local Math = {}
 
+function Math.wrap(x, startnumber, endnumber)
+  local delta = endnumber - startnumber
+  if delta < 0 then
+    err("endnumber must be larger than startnumber")
+  end
+  while x >= endnumber do
+    x = x - delta
+  end
+
+  while x < startnumber do
+    x = x + delta
+  end
+
+  return x
+end
+
 function Math.sign(x)
    if (x < 0) then
      return -1