Enhance vim syntax highlighting for 2.10

Enhance vim syntax highlighting for 2.10

- object types (and 'host' inside apply) are now green again
- special underlined macro highlighting
- add missing object types, attributes and constants
- add new constants and namespaces/references for 2.10
- Large refactoring into sub matches

I don't use nano, so we need a nano hero to incorporate
these changes here into their syntax highlighting file :)

refs #5683