[agb] Added function to change the text color

CHANGELOG.md

@@ -10,6 +10,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ### Added
 
 - Added `dot` and `cross` product methods for `Vector2D`.
+- Added `set_foreground_colour` and `set_background_colour` methods for `TextRenderer`.
 
 ### Fixed
 

agb/src/display/font.rs

@@ -154,6 +154,16 @@ impl<'a, 'b> TextWriter<'a, 'b> {
     pub fn commit(self) {
         self.text_renderer.commit(self.bg, self.vram_manager);
     }
+
+    pub fn set_foreground_colour(&mut self, colour: u8) -> &mut Self {
+        self.foreground_colour = colour;
+        self
+    }
+
+    pub fn set_background_colour(&mut self, colour: u8) -> &mut Self {
+        self.background_colour = colour;
+        self
+    }
 }
 
 fn div_ceil(quotient: i32, divisor: i32) -> i32 {