This changes a lot of things all across the EFL. Previously,
methods tagged @const had both their external prototype and
internal impl generated with const on object, while property
getters only had const on the external API. This is now changed
and it all has const everywhere.
Ref T6859.
Efl.Interpolator class is to interpolate a value.
Efl.Interpolator class has the following interpolation function classes
as its subclasses.
Efl.Interpolator.Linear
Efl.Interpolator.Accelerate
Efl.Interpolator.Decelerate
Efl.Interpolator.Sinusoidal
Efl.Interpolator.Divisor
Efl.Interpolator.Bounce
Efl.Interpolator.Spring
Efl.Interpolator.Cubic_Bezier