Rename the Project to openTill

This branch is a rebrand of the project from **Project Quagga** to **openTill**
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Why do this?
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I'm glad you brought that up, anonymous question-asker! The answer to this is three fold as follows:

**1. Image:** Quagga is some kinda crazy prehistoric horse/donkey/zebra, that doesn't really convey what our product is about...like, at all.

**2. Functionality:** openTill makes it immediately obvious that our software in some way relates to POS systems, making it more likely to come up in a search, while at the same time communicating that the software itself is free. This will also boost product discover-ability and product adoption.

**3. Potential for a play on words:** I believe this is the most important point. The name openTill, while already trendy, possesses massive opportunity for a professional services component named **openTill&infin;**...get it? because cause open 'till *infinity*...or are you just pouting for some reason? oh, THEN I GUESS JUST POUT