Refactoring WorkAdventureAPI.

Simplifying a lot what was done (even if the new code is a bit less automated, it allows to list exactly the methods we want to see deprecated and to add a notification message)

front/src/Api/iframe/chat.ts

@@ -0,0 +1,36 @@
+import type { ChatEvent } from '../Events/ChatEvent'
+import { isUserInputChatEvent, UserInputChatEvent } from '../Events/UserInputChatEvent'
+import { apiCallback, IframeApiContribution, sendToWorkadventure } from './IframeApiContribution'
+
+
+class WorkadventureChatCommands extends IframeApiContribution<WorkadventureChatCommands> {
+    chatMessageCallback?: (event: string) => void
+
+    callbacks = [apiCallback({
+        callback: (event: UserInputChatEvent) => {
+            this.chatMessageCallback?.(event.message)
+        },
+        type: "userInputChat",
+        typeChecker: isUserInputChatEvent
+    })]
+
+
+    sendChatMessage(message: string, author: string) {
+        sendToWorkadventure({
+            type: 'chat',
+            data: {
+                'message': message,
+                'author': author
+            } as ChatEvent
+        })
+    }
+
+    /**
+     * Listen to messages sent by the local user, in the chat.
+     */
+    onChatMessage(callback: (message: string) => void) {
+        this.chatMessageCallback = callback
+    }
+}
+
+export default new WorkadventureChatCommands()