Add PriceHistory support to the LinePlotChart

[scawful]

Implement the ability to load a PriceHistory's candle object into a LinePlotChart and provide options for controlling that chart akin to the CandleChart. This is a fairly straightforward task and has a good example (CandleChart and LinePlotChart) and a decent amount of wiggle room in terms of implementation. Currently the line plot chart just attempts to load and plot a csv file from the assets folder that represents some asset over time (I've been using it with my TDA daily portfolio balance csv file) but it would be better suited as a price chart, and maybe repurposed as a balance/performance chart elsewhere.