Use Bindable{Float,Double}s everywhere

To avoid further floating-point comparison bugs, remove all usages of
Bindable<{float,double}>, replacing them with their
Bindable<Float,Double> counterparts.

osu.Game.Rulesets.Osu/Objects/Drawables/DrawableSlider.cs

@@ -37,7 +37,7 @@ namespace osu.Game.Rulesets.Osu.Objects.Drawables
 
         private readonly IBindable<Vector2> positionBindable = new Bindable<Vector2>();
         private readonly IBindable<int> stackHeightBindable = new Bindable<int>();
-        private readonly IBindable<float> scaleBindable = new Bindable<float>();
+        private readonly IBindable<float> scaleBindable = new BindableFloat();
 
         public DrawableSlider(Slider s)
             : base(s)