Improved Sprite and SpriteCharacter.

[NEW] Added SpriteBase.flash().
[NEW] Added SpriteBase.update().
[NEW] Added SpriteBase.getColor().
[NEW] Added name, transparent, idle, index, pattern, speed, opacity, and
animationcounter attributes to GameCharacter. And now it updates sprite
animation.
[MOD] Added new debug information to SceneStage.
[MOD] Moved the position initialization from GamePlayer.new() to
GameStage.load().
[MOD] Now SpritePicture takes image name as parameter and loads it
immediately.
[ENH] Now the Rectangle.set() will remain the original value when any
parameter is omitted.
[FIX] Fixed wrong lineheight in Font.
[FIX] Fixed wrong display area in debug information.
[FIX] Fixed the missing call to parent in GamePlayer.update().
[DEL] Removed SpriteBase.render().
[DEL] Removed SpriteBase.setImage().
[DEL] Removed name and picture from SpritePicture.