Added 60 second delay for pipi loop and fixed an issue when invoking commands !warpipi or !zuspät, that resulted in the pipi loop not noticing, when there is no pipi vote.

- Added loop for pipimeter. Every PIPIMETER_LOOP minutes (when the stream is live), when the pipimeter is not empty, the current count is sent into the chat (same as invoking !pipimeter as mod). In addition to that, the loop checks, whether the stream turned live after being offline for at least PIPI_RESET_THRESHOLD minutes. In that case, the pipi count is reset.
- Added giveaway_cog.py and pipi_cog.py to source Giveaway and Pipi related functionality out into those cogs.
- Changed the way, the pipimeter is colored. Instead of using absolute values, now the percentage controls the color change.

Fix semantical error with comparing a str to a List[str]

Fixed issue with divide by zero error in the rare case, where somebody sends !pipi at a moment, where no chatter was recognized by twitch so far.
Added !hauge-command, that sends a link to github into the twitch chat

Added Giveaway-Bot informations

Giveaway feature

Added delay of VOTE_DELAY_INTERIM seconds between the end of a vote and the start of another vote. This should avoid problems with votes, that come in shortly after a vote already ended and triggered a new one.

Redis functionality

Nicer overview + Redis functionality