Live-trading-indicators

- New timeframe - 1s
- Optimized loading of a large volume of quotes - [benchbarks](https://github.com/hal9000cc/live_trading_indicators/blob/master/benchmark_results.md)
- Added intermediate saving when loading for a long time

- Fix for python 3.7

- Optimized data loading, reduced the number of requests to the data source on high timeframes.
- Added the ability to use the **ccxt** library as a data source.

- The cache of saved data has been significantly updated, the number of files has been reduced.
- Indicators whose result depends on the starting point are no longer cached, but are always calculated from the initial time (OBV, ADL, VWAP, etc.)
- New indicator - ADL.
- New indicator - VWAP.
- New indicator - Awesome oscillator.

- New indicator - Keltner
- Fixed bug that occurs at the end of the day in live mode

- New indicator - OHLCVM (quotes with the price of the maximum volume of the bar)
- New indicator - VolumeClusters (OHLCVM and volume clusters is determined by the lower timeframe)
- New indicator - ROC
- New indicator - TEMA
- New indicator - TRIX
- New indicator - ADX
- New indicator - VWMA