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/stdio/printf.c

@@ -77,6 +77,18 @@ int printf(const char* restrict format, ...) {
 			if (!print(buffer, len))
 				return -1;
 			written += len;
+		} else if (*format == 'f') {
+			format++;
+			double d = (double) va_arg(parameters, double);
+			dtoa(d, buffer, 5);
+			size_t len = strlen(buffer);
+			if (maxrem < len) {
+				// TODO
+				return -1;
+			}
+			if (!print(buffer, len))
+				return -1;
+			written += len;
 		} else if (*format == 'u') {
 			format++;
 			unsigned int i = (unsigned int) va_arg(parameters, unsigned int);