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/ComputedType.js

@@ -0,0 +1,16 @@
+/** @typedef {import("./IEntity").default} IEntity */
+
+export default class ComputedType {
+
+    #f
+
+    /** @param {Function} f */
+    constructor(f) {
+        this.#f = f
+    }
+
+    /** @param {IEntity} entity */
+    compute(entity) {
+        return this.#f(entity)
+    }
+}