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

includes/std/math.pat

@@ -0,0 +1,64 @@
+#pragma once
+
+namespace std::math {
+
+	fn min(auto a, auto b) {
+		return a < b ? a : b;
+	};
+	
+	fn max(auto a, auto b) {
+		return a > b ? a : b;
+	};
+
+	fn clamp(auto x, auto min, auto max) {
+		return (x < min) ? min : ((x > max) ? max : x); 
+	};
+
+	fn abs(auto x) {
+		if (x < 0) return -x;
+		else return x;
+	};
+
+	fn sign(auto x) {
+	if (x > 0)
+		return 1;
+	else if (x < 0)
+		return -1;
+	else
+		return 0;
+};
+
+	fn copy_sign(auto x, auto y) {
+		if (y >= 0)
+			return std::math::abs(x);
+		else
+			return -std::math::abs(x);
+	};
+
+	fn factorial(u128 x) {
+		u128 result;
+		
+		result = x;
+		while (x > 1) {
+			x = x - 1;
+			result = result * x;
+		}
+		
+		return result;
+	};
+
+	fn comb(u128 n, u128 k) {
+		if (k > n)
+			return 0;
+		else
+			return std::math::factorial(n) / (std::math::factorial(k) * std::math::factorial(n - k));
+	};
+
+	fn perm(u128 n, u128 k) {
+		if (k > n)
+			return 0;
+		else
+			return std::math::factorial(n) / std::math::factorial(n - k);
+	};
+
+}