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/Objects/HitObject.cs

@@ -34,7 +34,7 @@ namespace osu.Game.Rulesets.Objects
         /// </summary>
         public event Action DefaultsApplied;
 
-        public readonly Bindable<double> StartTimeBindable = new Bindable<double>();
+        public readonly Bindable<double> StartTimeBindable = new BindableDouble();
 
         /// <summary>
         /// The time at which the HitObject starts.