Annotations automation

[jkuczm]

• Add \mmaDefineAnnotation and \mmaDefineFrontEndInStyle functions.
• Rename annotation keys: ...* -> more....
• Also add delete... keys.
• Shorten link annotation commands:
  • \mmaLinkTarget -> \mmaLnT,
  • \mmaLinkLocal -> \mmaLnL,
  • \mmaLinkBuiltin -> \mmaLnB.