Fix market watcher candles endpoints - Closes #368

[MichalTuleja]

What was the problem?

The candlestick charts for the Bittrex exchange were not shown correctly. The backend part of the application that is responsible for this was missing the crucial data, that were not able to be gathered from the original data source - Bittrex API version 1.1.

How did I fix it?

I switched to the version 2.0 of the Bittrex exchange API.
The new data provided by the API are candlestick data itself, with an interval of 5 mins.
Other charts, such as hour and day charts are generated from the same data source.

I've copied a lot of the original code from the abstract.js file. Most of the code was reused, excluding the grouping part - these functions are performing different operations, based on the data provided in the version 2.0 of Bittrex API.

There is also significant overuse of the Underscore library - I've mentioned it in the issue #375.

How to test it?

Use Market Watcher to determine whether the candlesticks are rendered correctly.

Review checklist

• The PR solves Fix market watcher candles endpoints #368
• All new code is covered with unit tests
• All new features are covered with e2e tests
• All new code follows best practices

[karmacoma]

Closing in favour of: https://github.com/LiskHQ/lisk-explorer/tree/368-fixings-in-market-watcher