[Pas2js] pas2js record incompatibility

[Mattias Gaertner]

Hi,

I changed the way how records are converted to JS.

Records are now created as Object instead of function:
- records now have hidden (not enumerable) functions $new, $assign, $clone, $eq
- passing records to var argument now passes the record directly instead of creating a temporary setter
- Assigning a record, e.g. aRecord:=value, now copies the values, while
  keeping the JS object. This makes pointer of record Delphi/FPC
  compatible.

In the pas2js packages I found only one asm-block that needed a
change, so I hope it works as flawless for you too.

Mattias