Make only one request to Twitch instead of for each server

[TrojanerHD]

Follow-up PR for #67

We do not want to make a request to Twitch for each server as shown here:

TrojanerBot/src/twitch/LiveChannel.ts

Lines 10 to 12 in 21cfe10

	new TwitchHelper(this.streamerFetch.bind(this)).update(
	(): string[] => Settings.settings.streamers
	);

Instead we want to bundle the requests into one and make only one request to Twitch in order to prevent rate limiting when the bot runs on too many servers

[MelanX]

Keep in mind that a maximum count of 100 streams per request is allowed, see here:
https://dev.twitch.tv/docs/api/reference/#get-streams