refactor mega-commit.

- reorganised the entire project so that the entire kernel is a single codebase rather than a kernel and a libk.

kernel/src/resources/font/mod.rs

@@ -0,0 +1,46 @@
+use libm::include_font;
+pub static FONT_SPLEEN_8X16: Font =
+    Font::new(include_font!("./kernel/resources/font/spleen-8x16.psf"));
+
+pub static FONT_CP850_8X16: Font =
+    Font::new(include_font!("./kernel/resources/font/cp850-8x16.psf"));
+
+// pub struct Font(pub [[u8; 16]; 512]);
+
+pub struct Font {
+    width: usize,
+    height: usize,
+    length: u16,
+    data: [[u8; 16]; 512],
+}
+
+impl Font {
+    pub const fn new(data: [[u8; 16]; 512]) -> Font {
+        Font {
+            width: 8,
+            height: 16,
+            length: data.len() as u16,
+            data,
+        }
+    }
+
+    pub const fn glyph_for(&self, c: u16) -> &[u8] {
+        if c > self.length {
+            return &self.data[0];
+        }
+
+        &self.data[c as usize]
+    }
+
+    pub const fn width(&self) -> usize {
+        self.width
+    }
+
+    pub const fn height(&self) -> usize {
+        self.height
+    }
+
+    pub fn default() -> &'static Font {
+        &FONT_CP850_8X16
+    }
+}