Many changes all around. Started main menu.

Added Drawable, Sprite and SoundEffect classes.
Added comments to Fader class.

src/ui/cursor.lua

@@ -0,0 +1,35 @@
+------------------------------------------------------------------------------
+-- Imports
+------------------------------------------------------------------------------
+
+local make_class = require 'src.utils.classes'
+local Sprite     = require 'src.ui.sprite'
+
+
+------------------------------------------------------------------------------
+-- Class definitions
+------------------------------------------------------------------------------
+
+local Cursor = make_class(Sprite)
+
+
+------------------------------------------------------------------------------
+-- Class methods
+------------------------------------------------------------------------------
+
+function Cursor:_init(x, y)
+    Sprite._init(self, 'imgs/pointer.png', x, y)
+end
+
+
+function Cursor:mousemoved(x, y)
+    self.x = x
+    self.y = y
+end
+
+
+------------------------------------------------------------------------------
+-- Module return
+------------------------------------------------------------------------------
+
+return Cursor