add support for interactive data visualization for fprime channels & events

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Installs Roassal (pharo image) with NeoCSV such that it can be opened from pharo launcher

closes #22

should merge #28 first, then rebase this PR off main, as to test if Roassal can read time-series data cached from fprime

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Loads line and scatter plot examples, with hover and view a data point capability, as of 9123981

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CSV parser works as of 4dc92de

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Memo: need to download pharo image + vm into install_files/ for installing pharo in builds, as Zeroconf server seems unreliable at times

EDIT: attempting to install from local zip file results in hanging build, so reverting to using zeroconf server for now.

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Memo: need to install XML parser as to be able to parse fprime packet spec

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XML parser works for collecting custom channel names from FPrime packet spec as of d60ff2d

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Dark Mode enabled as default in RoassalPlayground as of 78287d7

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Dark mode works in Pharo Launcher as of 9a83216

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Interactive (popup) scatter plot with chart labels as of 9a83216

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Can render time series line plot (with interactive popup) of a single channel of persistent FPrime telemetry data with corresponding data types and chart title parsed from channel name defined in packet spec

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RoassalPlayground supports exporting chart as SVG file onto disk as of 4b1c964