Added API Key Picker to the API Fetcher
It is a very basic implementation that go through list and hands out the next API key in line.
When reaching end of list wraps around and start at first key again.
In order to use this replace the API_KEY_LIST.data with the API Keys with one key per line
API_KEY_LIST.data should look like the following:
IAMTHEAPIKEY#1
IAMTHEAPIKEY#2
....