ecore: declare efl_app and the inherits stable

fix T7556
fix T7514
fix T7514
fix T7514

Reviewed-by: Cedric BAIL <cedric.bail@free.fr>
Differential Revision: https://phab.enlightenment.org/D8001

src/lib/ecore/efl_app.eo

@@ -1,6 +1,6 @@
 import efl_types;
 
-abstract @beta Efl.App extends Efl.Loop implements Efl.Core.Command_Line
+abstract Efl.App extends Efl.Loop implements Efl.Core.Command_Line
 {
    [[Object representing the application itself]]
    data: null;

src/lib/ecore/efl_loop.eo

@@ -4,7 +4,7 @@ struct Efl.Loop_Arguments {
    initialization: bool; [[Set to $true when the program should initialize its internal state. This happen once per process instance.]]
 }
 
-abstract @beta Efl.Loop extends Efl.Task
+abstract Efl.Loop extends Efl.Task
 {
    [[The Efl Main Loop
 

src/lib/ecore/efl_loop_consumer.eo

@@ -1,4 +1,4 @@
-abstract @beta Efl.Loop_Consumer extends Efl.Object
+abstract Efl.Loop_Consumer extends Efl.Object
 {
    [[An @Efl.Loop_Consumer is a class which requires one of the parents to provide
      an @Efl.Loop interface when performing @Efl.Object.provider_find. It will enforce this by

src/lib/ecore/efl_task.eo

@@ -15,7 +15,7 @@ enum Efl.Task_Flags {
    no_exit_code_error = 4,
 }
 
-abstract @beta Efl.Task extends Efl.Loop_Consumer
+abstract Efl.Task extends Efl.Loop_Consumer
 {
    [[ ]]
    methods {