plgcmap1_range: Get the cmap1 argument range for continuous color plots

`plgcmap1_range`: Get the cmap1 argument range for continuous color plots
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`plgcmap1_range (`	`min_color`,
	`max_color)`;

Get the cmap1 argument range for continuous color plots. (Use plscmap1_range to set the cmap1 argument range.)

min_color (PLFLT_NC_SCALAR, output): Returned value of the current minimum cmap1 argument.
max_color (PLFLT_NC_SCALAR, output): Returned value of the current maximum cmap1 argument.

Redacted form: plgcmap1_range(min_color, max_color)

This function is currently not used in any example.

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`plgchr`: Get character default height and current (scaled) height	Home	`plgcol0`: Returns 8-bit RGB values for given color index from cmap0