Add extra TextStyle and ComponentTextStyle properties

[dabley]

These changes add support for a number of additional TextStyle and ComponentTextStyle properties:

Extra TextStyle properties:

• fontFamily
• fontWeight
• fontStyle
• fontWidth

Extra ComponentTextStyle properties:

• firstLineIndent
• fontScalng
• hangingPunctuation
• paragraphSpacingAfter
• paragraphSpacingBefore

The TextStyle::fontWeight property is allowed to be a string or an integer, so that it can be set to a named font weight (e.g. "medium") or a numeric one (e.g. 500). (Applenews doesnt allow numeric font weights to be supplied as strings - so "500" is not valid.)

The ComponentTextStyle::linkStyle property can now optionally be set using an array, which makes things easier when creating a ComponentTextStyle object.