#886 Annotation text box should use style string instead of many separate controls

[Jeremy Faden]

See https://github.com/das-developers/das2java/issues/189. Autoplot will need code which converts old .vap formats to this, and from this to old .vap formats for backward compatibility.

[Jeremy Faden]

See also https://sourceforge.net/p/autoplot/feature-requests/884/

[Jeremy Faden]

This will remove the following properties:

• foreground
• background
• textColor
• overrideColors
• fontSize

[Jeremy Faden]

Also the property "url" should be removed, since we'll need code to convert from and to old .vap versions.