plgchr: Get character default height and current (scaled) height

`plgchr`: Get character default height and current (scaled) height
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`plgchr (`	`p_def`,
	`p_ht)`;

Get character default height and current (scaled) height.

p_def (PLFLT_NC_SCALAR, output): Returned value of the default character height (mm).
p_ht (PLFLT_NC_SCALAR, output): Returned value of the scaled character height (mm).

Redacted form: plgchr(p_def, p_ht)

This function is used in example 23.

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