Does a lot of work towards the PIT

Added a math library, with clamp and POW.
added printf support for printing doubles
added a few helper functions in PIT for calcaulting the time in seconds of a clock cycle based on divisor

libc/stdlib/itoa.c

@@ -1,5 +1,7 @@
 #include <stdbool.h>
 #include <stdint.h>
+#include <string.h>
+#include <math.h>
 
 static void reverse(char* buf, int len)
 {
@@ -273,3 +275,35 @@ char* utoa(unsigned int num, char* buf, int base)
 	reverse(buf, i); // reverse, since we did it backwards!
 	return buf;
 }
+
+static int dbl_to_str(int x, char* buf, int d)
+{
+	int i = 0;
+	while (x) {
+		buf[i++] = (x % 10) + '0';
+		x = x / 10;
+	}
+
+	while (i < d)
+		buf[i++] = '0';
+
+	reverse(buf, i);
+	buf[i] = '\0';
+	return i;
+}
+
+char* dtoa(double n, char* buf, int afterpoint)
+{
+	int whole = (int) n;
+	
+	double decimals = n - (double) whole;
+
+	int i = dbl_to_str(whole, buf, 0);
+	if (afterpoint != 0) {
+		buf[i] = '.'; // add the decimal
+
+		decimals = decimals * pow(10, afterpoint);
+		dbl_to_str((int) decimals, buf + i + 1, afterpoint + 1);
+	}
+	return buf;
+}