Remove @beta from Efl.Interpolator classes

All of them, except the divisor interpolator, because I still don't
know what it does.
Ref T8445

Reviewed-by: Cedric BAIL <cedric.bail@free.fr>
Differential Revision: https://phab.enlightenment.org/D10893

src/lib/ecore/efl_accelerate_interpolator.eo

@@ -1,10 +1,12 @@
-class @beta Efl.Accelerate_Interpolator extends Efl.Object implements Efl.Interpolator
+class Efl.Accelerate_Interpolator extends Efl.Object implements Efl.Interpolator
 {
    [[Accelerated interpolator. It starts slow and accelerates, stopping abruptly when
      it reaches $[1.0].
 
      Internally it uses the first half of a sinus rise (from 0 to 0.5) and the steepness
      can be customized.
+
+     @since 1.24
    ]]
    data: Efl_Accelerate_Interpolator_Data;
    methods {

src/lib/ecore/efl_bounce_interpolator.eo

@@ -1,9 +1,11 @@
-class @beta Efl.Bounce_Interpolator extends Efl.Object implements Efl.Interpolator
+class Efl.Bounce_Interpolator extends Efl.Object implements Efl.Interpolator
 {
    [[Bouncing interpolator. The value quickly reaches $[1.0] and then bounces back
      a number of times before stopping at $[1.0].
 
      The number of bounces and how far it goes back on every bounce can be customized.
+
+     @since 1.24
    ]]
    data: Efl_Bounce_Interpolator_Data;
    methods {

src/lib/ecore/efl_cubic_bezier_interpolator.eo

@@ -1,10 +1,12 @@
-class @beta Efl.Cubic_Bezier_Interpolator extends Efl.Object implements Efl.Interpolator
+class Efl.Cubic_Bezier_Interpolator extends Efl.Object implements Efl.Interpolator
 {
    [[Cubic Bezier interpolator. It starts slow, then moves quickly and then slows down
      again before stopping.
 
      The exact shape of the mapping curve can be modified through the @.control_points
      property.
+
+     @since 1.24
    ]]
    data: Efl_Cubic_Bezier_Interpolator_Data;
    methods {

src/lib/ecore/efl_decelerate_interpolator.eo

@@ -1,10 +1,12 @@
-class @beta Efl.Decelerate_Interpolator extends Efl.Object implements Efl.Interpolator
+class Efl.Decelerate_Interpolator extends Efl.Object implements Efl.Interpolator
 {
    [[Decelerated interpolator. It starts fast and decelerates, stopping smoothly when
      it reaches $[1.0].
 
      Internally it uses the second half of a sinus rise (from 0.5 to 1.0) and the steepness
      can be customized through the @.slope property.
+
+     @since 1.24
    ]]
    data: Efl_Decelerate_Interpolator_Data;
    methods {

src/lib/ecore/efl_linear_interpolator.eo

@@ -1,6 +1,8 @@
-class @beta Efl.Linear_Interpolator extends Efl.Object implements Efl.Interpolator
+class Efl.Linear_Interpolator extends Efl.Object implements Efl.Interpolator
 {
    [[Linear interpolation (pass-through). Input values are used unmodified as output.
+
+     @since 1.24
    ]]
    data: Efl_Linear_Interpolator_Data;
    implements {

src/lib/ecore/efl_sinusoidal_interpolator.eo

@@ -1,9 +1,11 @@
-class @beta Efl.Sinusoidal_Interpolator extends Efl.Object implements Efl.Interpolator
+class Efl.Sinusoidal_Interpolator extends Efl.Object implements Efl.Interpolator
 {
    [[Sinusoidal interpolator. It starts slow, then moves quickly and then slows down
      again before stopping.
 
      How long it stays in the quick zone (the slope of the curve) can be customized.
+
+     @since 1.24
    ]]
    data: Efl_Sinusoidal_Interpolator_Data;
    methods {

src/lib/ecore/efl_spring_interpolator.eo

@@ -1,9 +1,11 @@
-class @beta Efl.Spring_Interpolator extends Efl.Object implements Efl.Interpolator
+class Efl.Spring_Interpolator extends Efl.Object implements Efl.Interpolator
 {
    [[Spring interpolator. The value quickly reaches $[1.0] and then oscillates
      around it a number of times before stopping (as if linked with a spring).
 
      The number of oscillations and how quickly it stops can be customized.
+
+     @since 1.24
    ]]
    data: Efl_Spring_Interpolator_Data;
    methods {

src/lib/efl/interfaces/efl_interpolator.eo

@@ -1,4 +1,4 @@
-interface @beta Efl.Interpolator
+interface Efl.Interpolator
 {
    [[Interface providing interpolation capabilities.
    
@@ -11,6 +11,8 @@ interface @beta Efl.Interpolator
 
      For example implementations see @Efl.Accelerate_Interpolator, @Efl.Decelerate_Interpolator
      or @Efl.Bounce_Interpolator.
+
+     @since 1.24
    ]]
    methods {
       interpolate {