Removed messy debug logging, added print_oneshot!()

kernel/src/prelude.rs

@@ -0,0 +1,7 @@
+pub use crate::{
+    arch::x86_64::drivers::framebuffer::colour::Colour,
+    debug, debugln, eprint, eprintln, print, print_log, print_oneshot, println,
+    println_log, serial_print, serial_println,
+    std::debug::_debug,
+    std::io::{_print, _print_err, _print_log, _serial_write},
+};