COVID-19: Daily momentum

This indicator shows 14-days moving average of daily rate of change (momentum, acceleration), in other words:

- up trends means that virus accelerates at the rate displayed on the right scale
- consolidation/horizontal movement - virus spreads at constant rate
- down trend - virus looses momentum IMPORTANT: the virus STILL accelerates but at a lower rate

By default the graphic displays World vs. EU vs. US vs. Asia while individual countries are available in Settings.

- EU includes the following countries (DE, FR, IT, ES, CH), all with more than 10k confirmed cases and more than 1k new daily infections.
- Asia includes CH and KR

To use the indicator it is important to disconnect main chart from the right scale, on main chart click on More (the 3 dots) -> Pin to scale -> Select "No Scale".

Release Notes:

# Changelog

## 0.0.2 - 2020-04-02

### Added
- Netherlands (NL) - more than 1k new cases / day
- Belgium (BE) - more than 1k new cases / day
- Austria (AT) - more than 10k total cases

### Changed
- rename main function momentum

### Removed
- population texts

Release Notes:

# Changelog

## 0.0.3 - 20200406

### Added
- Portugal, PT - with more than 10k total cases

### Changed
- refactoring and DRY the code
- adjust labels' position

Release Notes:

Adding Iran, Turkey, India, Indonesia, each of them with over 1k deaths

Release Notes:

Remove COVID19 prefix, fix GB series' name

Release Notes:

Fix GB data source name.