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/cheer3.json

@@ -2,11 +2,6 @@
     "input": "@badge-info=;badges=bits-leader/3;bits=5;color=;display-name=slyckity;emotes=;flags=;id=fd6c5507-3a4e-4d24-8f6e-fadf07f520d3;mod=0;room-id=111448817;subscriber=0;tmi-sent-ts=1567824273752;turbo=0;user-id=143114011;user-type= :slyckity!slyckity@slyckity.tmi.twitch.tv PRIVMSG #pajlada :Cheer100",
     "output": [
         {
-            "badgeInfos": {
-            },
-            "badges": [
-                "bits-leader"
-            ],
             "channelName": "pajlada",
             "count": 1,
             "displayName": "slyckity",
@@ -174,6 +169,11 @@
             "searchText": "slyckity  slyckity: Cheer100 ",
             "serverReceivedTime": "2019-09-07T02:44:33Z",
             "timeoutUser": "",
+            "twitchBadgeInfos": {
+            },
+            "twitchBadges": [
+                "bits-leader"
+            ],
             "userID": "143114011",
             "usernameColor": "#ff0000ff"
         }