Add support for more image uploader services (#1741)

The list of links that have been uploaded is now also stored in the json format instead of csv

src/common/Env.hpp

@@ -14,8 +14,6 @@ public:
     const QString recentMessagesApiUrl;
     const QString linkResolverUrl;
     const QString twitchEmoteSetResolverUrl;
-    const QString imageUploaderUrl;
-    const QString imageUploaderFormBody;
     const QString twitchServerHost;
     const uint16_t twitchServerPort;
     const bool twitchServerSecure;