includes/std: Moved stdlib to std folder, added all builtin functions

includes/std/rustint.pat

@@ -0,0 +1,17 @@
+#pragma once
+
+namespace std {
+
+    using i8   = s8;
+    using i16  = s16;
+    using i32  = s32;
+    using i64  = s64;
+    using i128 = s128;
+
+    using f32 = float;
+    using f64 = double;
+
+    using usize = u64;
+    using isize = s64;
+    
+}