resolve_color_string_or_rgb Subroutine

public subroutine resolve_color_string_or_rgb(color_str, color_rgb, context, rgb_out, has_color)

Merge string/RGB color inputs into a single RGB triple.

Precedence: - RGB triple wins if supplied (explicit numeric value from the user). - Otherwise the string is parsed via fortplot_colors::parse_color. - If parsing fails, emit a single warning tagged with context and report has_color = .false. so the caller can fall back.

Arguments

Type	Intent	Optional	Attributes		Name
character(len=*),	intent(in),	optional		::	color_str
real(kind=wp),	intent(in),	optional		::	color_rgb(3)
character(len=*),	intent(in)			::	context
real(kind=wp),	intent(out)			::	rgb_out(3)
logical,	intent(out)			::	has_color