[Feature] show up or down color of candle bar based on previous close and current close

[manchingchan1992]

Feature Description

Can add a new candle type to show up or down color of candle bar based on previous close and current close. Currently up or down color depends on current close > current open or current close < current open

To Do

CandleBarView add logic to check up or down color based on previous close >current close or previous close < current close.

[dgandram]

Definitely, this is a must. I'm just beginning to use klinecharts so I don't know how to do it but I will try to implement it and if I'm able to, I will do a PR.