refactor: rename Badge to TwitchBadge (#6706)

this change is made to clarify that the previously-called Badge object
is actually specialized for Twitch badges

tests/snapshots/IrcMessageHandler/sub-first-time.json

@@ -2,10 +2,6 @@
     "input": "@badges=subscriber/0,premium/1;color=#0000FF;display-name=byebyeheart;emotes=;id=fe390424-ab89-4c33-bb5a-53c6e5214b9f;login=byebyeheart;mod=0;msg-id=sub;msg-param-months=0;msg-param-sub-plan-name=Dakotaz;msg-param-sub-plan=Prime;room-id=39298218;subscriber=0;system-msg=byebyeheart\\sjust\\ssubscribed\\swith\\sTwitch\\sPrime!;tmi-sent-ts=1528190963670;turbo=0;user-id=131956000;user-type= :tmi.twitch.tv USERNOTICE #pajlada",
     "output": [
         {
-            "badgeInfos": {
-            },
-            "badges": [
-            ],
             "channelName": "",
             "count": 1,
             "displayName": "",
@@ -84,6 +80,10 @@
             "searchText": "byebyeheart just subscribed with Twitch Prime!",
             "serverReceivedTime": "",
             "timeoutUser": "",
+            "twitchBadgeInfos": {
+            },
+            "twitchBadges": [
+            ],
             "userID": "",
             "usernameColor": "#ff000000"
         }