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-message.json

@@ -2,13 +2,6 @@
     "input": "@badges=staff/1,broadcaster/1,turbo/1;color=#008000;display-name=ronni;emotes=;id=db25007f-7a18-43eb-9379-80131e44d633;login=ronni;mod=0;msg-id=resub;msg-param-months=6;msg-param-sub-plan=Prime;msg-param-sub-plan-name=Prime;room-id=11148817;subscriber=1;system-msg=ronni\\shas\\ssubscribed\\sfor\\s6\\smonths!;tmi-sent-ts=1507246572675;turbo=1;user-id=1337;user-type=staff :tmi.twitch.tv USERNOTICE #pajlada :Great stream -- keep it up!",
     "output": [
         {
-            "badgeInfos": {
-            },
-            "badges": [
-                "staff",
-                "broadcaster",
-                "turbo"
-            ],
             "channelName": "pajlada",
             "count": 1,
             "displayName": "ronni",
@@ -182,14 +175,17 @@
             "searchText": "ronni  ronni: Great stream -- keep it up! ",
             "serverReceivedTime": "2017-10-05T23:36:12Z",
             "timeoutUser": "",
+            "twitchBadgeInfos": {
+            },
+            "twitchBadges": [
+                "staff",
+                "broadcaster",
+                "turbo"
+            ],
             "userID": "1337",
             "usernameColor": "#ff008000"
         },
         {
-            "badgeInfos": {
-            },
-            "badges": [
-            ],
             "channelName": "",
             "count": 1,
             "displayName": "",
@@ -268,6 +264,10 @@
             "searchText": "ronni has subscribed for 6 months!",
             "serverReceivedTime": "",
             "timeoutUser": "",
+            "twitchBadgeInfos": {
+            },
+            "twitchBadges": [
+            ],
             "userID": "",
             "usernameColor": "#ff000000"
         }