Grammar refactoring

* Grammar refactoring WIP

* ISerializer.grammar

* Fixing various bugs in the grammar

* Small touch that improoves performance

* Fix unknown values grammar

* Various fixes

* Serialization refactoring to drop suboject logic

* Details fixed

* Entity attributes initialization refactoring

* JSDoc error fixed

* Rename value key to default

* Remove useless default

* Revert string keys

js/entity/UnknownKeysEntity.js

@@ -3,9 +3,8 @@ import IEntity from "./IEntity.js"
 export default class UnknownKeysEntity extends IEntity {
 
     static attributes = {
-        lookbehind:
-        {
-            value: "",
+        lookbehind: {
+            default: "",
             showDefault: false,
             ignore: true,
         },
@@ -16,7 +15,7 @@ export default class UnknownKeysEntity extends IEntity {
     }
 
     constructor(values) {
-        super(values)
+        super(values, true)
         /** @type {String} */ this.lookbehind
     }
 }