Reduce memory consumtion. Add "range"

lib/std/collections/range.c3

@@ -0,0 +1,26 @@
+/**
+ * @checked Type{} < Type{} : "The type must be comparable"
+ * @checked Type{} + (Type)1 : "The type must be possible to add to"
+ **/
+module std::collections::range<Type>;
+
+struct Range
+{
+	Type start;
+	Type end;
+}
+
+fn usz Range.len(Range* range) @operator(len)
+{
+	if (range.end < range.start) return 0;
+	return (usz)(range.end - range.start);
+}
+
+/**
+ * @require index < range.len() : "Can't index into an empty range"
+ **/
+fn Type Range.get(Range* range, usz index) @operator([])
+{
+    return range.start + (Type)index;
+}
+