Mplchart

- Added `STOCH` Indicator (Stochastic Oscillator)
- Added `LinePlot`, `AreaPlot` and `BarPlot` primitives

- Updated Pypi README

- Added `DMI` indicator (`ADX` is now a single series indicator)
- Added `ATRP` indicator (Average True Range Percentage)
- Plotting Logic moved out of indicators
- Experimental `color_scheme` and `Color` modifier

- Refactorings

- Refactorings

- Moved indicator ploting logic to `indicators` module
- Removed deprecated `helper` module
- Added support for minute data labels
- Removed deprecated stylesheet logic
- Added color options to most primitives