…get (already supported)

Parsing was modified to report 'new.target' as an AccessNode on an
IdentNode 'new' with property 'target'. 'import.meta' is modelled
identically.

… and import.meta

The JS parser reports new.target as an AccessNode for the property
"target" on the IdentNode "new". The parser has no KeyWord Node, else
that would be the best choice.

The lexer lexes new.target as three tokens:

- Keyword "new"
- Operator "."
- Identifier "target"

Both new.target and import.meta are declared as special properties with
special semantic as they are properties on keywords. The approach taken
here is to declare a helper object "metaproperties", declare the "new"
and "import" properties and their children there. After parsing the
properties are relocated from metaproperties into the global object,
where they will be picked up by the JsCompletion.

…dded comments and new lines