Include file restructure!

- include/ now has subdirs
- standard C headers will be in 'include/c'. Any program can include these
- all other header shall only be used by the kernel

include/c/math.h

@@ -0,0 +1,16 @@
+#ifndef MATH_H
+#define MATH_H
+
+// Constants
+#define PI 3.141592653589 // Should be good enough
+#define E  2.718281828459
+
+// Macros
+#define abs(x) ( (x) > 0 ? (x) : -(x) )
+#define sign(x) ( (x) == 0 ? 0 : ((x) < 0 ? -1 : 1 ) )
+
+#define floor(x) ( (int)(x) ) // C floors floats when converting to ints
+#define round(x) ( (int)((x) + 0.5) ) // Normal rounding
+#define ceil(x)  ( (int)((x) + 1) ) // Always rounds up
+
+#endif