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/Cargo.lock

@@ -9,7 +9,6 @@ dependencies = [
  "font8x8",
  "lazy_static",
  "limine",
- "micromath",
  "pc-keyboard",
  "pic8259",
  "spin 0.10.0",
@@ -67,12 +66,6 @@ dependencies = [
  "scopeguard",
 ]
 
-[[package]]
-name = "micromath"
-version = "2.1.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c3c8dda44ff03a2f238717214da50f65d5a53b45cd213a7370424ffdb6fae815"
-
 [[package]]
 name = "pc-keyboard"
 version = "0.8.0"