feat: 'clippingPathGrob()' and 'alphaMaskGrob()' improvements #78
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* `clippingPathGrob()` can now more efficiently compute a `rasterGrob()` approximation via `ragg::agg_capture()` and for `png_device` functions that support the clipping path feature such as`png(type = "cairo")`(#74). * `alphaMaskGrob()` can now more efficiently compute a `rasterGrob()` approximation for `png_device` functions that support the alpha mask feature such as`png(type = "cairo")`(#75). * `alphaMaskGrob()` and `clippingPathGrob()` now switch back to the previously open graphics device if they open and close any new graphics devices. closes #74, closes #75
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clippingPathGrob()can now more efficiently compute arasterGrob()approximation viaragg::agg_capture()and forpng_devicefunctions that support the clipping path feature such aspng(type = "cairo")(DeprecateclippingPathGrob()? #74).alphaMaskGrob()can now more efficiently compute arasterGrob()approximation forpng_devicefunctions that support the alpha mask feature such aspng(type = "cairo")(alphaMaskGrob()also can "direct capture" from built-in cairo device #75).alphaMaskGrob()andclippingPathGrob()now switch back to the previously open graphics device if they open and close any new graphics devices.closes #74, closes #75