Add simple paging, use rust libcore and compile without sse

kernel/paging/mod.rs

@@ -1,6 +0,0 @@
-/// A newtype representing a virtual address.
-#[derive(Copy, Clone, Debug, Eq, Ord, PartialEq, PartialOrd)]
-pub struct Virtual {
-    /// The inner value.
-    pub inner: usize,
-}

kernel/panic.rs

@@ -9,7 +9,7 @@ extern "C" fn eh_personality() {}
 #[cfg(not(test))]
 /// Required to handle panics
 #[lang = "panic_fmt"]
-extern "C" fn panic_fmt() -> ! {
+extern "C" fn panic_fmt(fmt: ::core::fmt::Arguments, file_line: &(&'static str, u32)) -> ! {
     loop {
         unsafe { halt() };
     }