Remove micromath dependency, improve primitive drawing speed by 300x,

add mouse support and interrupts on x86_64 using a ps2 mouse which
needed pic unmasking, add span filling to framebuffer, add back
without_interrupts to serial console and framebuffer, add a mouse
rectangle which tracks the mouse position and test the performance of
the drawing.

kernel/src/util.rs

@@ -42,3 +42,7 @@ pub fn test_performance<F: FnOnce()>(function: F) {
     println!("took {} ms", (TIMER.now() - start).elapsed());
     ret
 }
+
+pub fn get_bit(value: u8, position: u8) -> u8 {
+    (value >> position) & 1
+}