Chat相关表现&逻辑分离，新增ChatController

新增情绪机器人逻辑，
新增情绪切换视频逻辑

assets/resources/chat_ui/return_btn.png.meta

@@ -46,10 +46,10 @@
         "offsetY": 0,
         "trimX": 0,
         "trimY": 0,
-        "width": 36,
-        "height": 64,
-        "rawWidth": 36,
-        "rawHeight": 64,
+        "width": 89,
+        "height": 90,
+        "rawWidth": 89,
+        "rawHeight": 90,
         "borderTop": 0,
         "borderBottom": 0,
         "borderLeft": 0,
@@ -61,17 +61,17 @@
         "meshType": 0,
         "vertices": {
           "rawPosition": [
-            -18,
-            -32,
+            -44.5,
+            -45,
             0,
-            18,
-            -32,
+            44.5,
+            -45,
             0,
-            -18,
-            32,
+            -44.5,
+            45,
             0,
-            18,
-            32,
+            44.5,
+            45,
             0
           ],
           "indexes": [
@@ -84,12 +84,12 @@
           ],
           "uv": [
             0,
-            64,
-            36,
-            64,
+            90,
+            89,
+            90,
             0,
             0,
-            36,
+            89,
             0
           ],
           "nuv": [
@@ -103,13 +103,13 @@
             1
           ],
           "minPos": [
-            -18,
-            -32,
+            -44.5,
+            -45,
             0
           ],
           "maxPos": [
-            18,
-            32,
+            44.5,
+            45,
             0
           ]
         },