Many changes all around. Started main menu.

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

src/ui/cursor.lua

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+------------------------------------------------------------------------------
+-- 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

src/ui/drawable.lua

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+------------------------------------------------------------------------------
+-- Imports
+------------------------------------------------------------------------------
+
+local make_class = require 'src.utils.classes'
+
+
+------------------------------------------------------------------------------
+-- Class definitions
+------------------------------------------------------------------------------
+
+local Drawable = make_class()
+
+
+------------------------------------------------------------------------------
+-- Class methods
+------------------------------------------------------------------------------
+
+function Drawable:_init()
+end
+
+
+function Drawable:load()
+end
+
+
+function Drawable:update(_)
+end
+
+
+function Drawable:draw()
+end
+
+
+function Drawable:unload()
+end
+
+
+function Drawable:keypressed(_, _ , _)
+end
+
+
+function Drawable:textinput(_)
+end
+
+
+function Drawable:keyreleased(_, _)
+end
+
+
+function Drawable:mousemoved(_, _, _, _)
+end
+
+
+function Drawable:mousepressed(_, _, _)
+end
+
+
+function Drawable:mousereleased(_, _, _)
+end
+
+------------------------------------------------------------------------------
+-- Module return
+------------------------------------------------------------------------------
+
+return Drawable

src/ui/sprite.lua

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+------------------------------------------------------------------------------
+-- Imports
+------------------------------------------------------------------------------
+
+local love       = require 'love'
+local make_class = require 'src.utils.classes'
+local Drawable   = require 'src.ui.drawable'
+
+------------------------------------------------------------------------------
+-- Class definitions
+------------------------------------------------------------------------------
+
+local Sprite = make_class(Drawable)
+
+
+------------------------------------------------------------------------------
+-- Class methods
+------------------------------------------------------------------------------
+
+function Sprite:_init(sprite_name, x, y)
+    self.sprite_name = sprite_name
+    self.x = (x ~= nil and x) or 0
+    self.y = (y ~= nil and y) or 0
+end
+
+
+function Sprite:load()
+    self.sprite = love.graphics.newImage(self.sprite_name)
+end
+
+
+function Sprite:draw()
+    if self.sprite ~= nil then
+        love.graphics.draw(self.sprite, self.x, self.y)
+    end
+end
+
+
+function Sprite:unload()
+    self.sprite = nil
+end
+
+
+------------------------------------------------------------------------------
+-- Module return
+------------------------------------------------------------------------------
+
+return Sprite