tsview: support --shp-file options as well (#1436)

+ support --shp-file related options in tsview.py as well

+ add `is_native_reference_point()` for easier re-use and allow for the potential geo2radar coordinate conversion error, which is usually less than or about 1 pixel.

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Co-authored-by: sourcery-ai[bot] <58596630+sourcery-ai[bot]@users.noreply.github.com>