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

includes/std/bit.pat

@@ -0,0 +1,37 @@
+#pragma once
+
+namespace std::bit {
+
+	fn popcount(u128 x) {
+		x = (x & (std::limits::u128_max() /  3)) + ((x >> 1) & (std::limits::u128_max() /  3));
+		x = (x & (std::limits::u128_max() /  5)) + ((x >> 2) & (std::limits::u128_max() /  5));
+		x = (x & (std::limits::u128_max() / 17)) + ((x >> 4) & (std::limits::u128_max() / 17));
+		
+		return x % 0xFF;
+	};
+
+	fn has_single_bit(u128 x) {
+		return x != 0 && (x & (x - 1)) == 0;
+	};
+	
+	fn bit_ceil(u128 x) {		
+		if (x == 0) return 0;
+		
+		u8 i;
+		while ((1 << i) < x)
+			i = i + 1;
+		
+		return 1 << i;
+	};
+	
+	fn bit_floor(u128 x) {
+		if (x == 0) return 0;
+		
+		u8 i;
+		while ((x >> i) > 0)
+			i = i + 1;
+		
+		return 1 << (i - 1);
+	};
+
+}