Remove 2 unneeded todos

No masking needed, since we use transparent .png files
SetSmooth() doesn't seem to be needed anymore with sf::Texture
pe::Entity::SetTexture(): Don't set arbitrary texture rect

The user should decide what the texture rect should be.
This caused the "stick bug".
https://github.com/Moosader/Pickin-Open-Sticks/issues/4
pe::Animation::Animate(): Set correct Texture rect

The new sf::Rect format is (top,left,width,height)
instead of (top,left,right,bottom)
Character: Set correct texture rect