Program name and version should be passed to XML builder

[cjcodeproj]

The xml builder modules generate a version string for the calling program.

musicscan/src/musicscan/xml/builder.py

Lines 50 to 60 in 40be991

	def build_head(self) -> str:
	'''
	Build the start of the album XML.
	'''
	timestamp = datetime.datetime.now()
	output = XML_DECLARATION
	output += "<medialist xmlns='http://vectortron.com/xml/media/media'"
	output += " xmlns:xi='http://www.w3.org/2001/XInclude'>\n"
	output += f" <!-- created by id3scan v{VERS_STR} ({timestamp}) -->\n"
	output += " <media>\n"
	return output

But that data is hard coded, when theoretically there could be other programs using this framework to generate a XML structure.

A mechanism to pass the program name and version to the builder code should be figured out.