Update the coinlist on each execution

[mbinette]

The app currently uses a coinlist.json file that is included with the app. That list has changed and the only way to update it is to manually replace it with a new list from https://min-api.cryptocompare.com/data/all/coinlist

The app is only using the Name and CoinName values from the coinlist.json which is an 8mb file with a lot more info. Instead, use https://min-api.cryptocompare.com/data/all/coinlist?summary=true and instead of Name use Symbol and instead of CoinName use FullName. The summary API call is only 708kb and could be run each time the application is started to make sure it is always up to date.

I don't know why the summary=true API call didn't include Name and CoinName instead because it would have been even smaller but that is cryptocompare.com's issue, not this apps.