[Pas2js] Data Abstract support

[Michael Schnell]

> As a small Christmas gift, I committed support for Remobjects Data Abstract in
> pas2js: The TDAConnection and TDADataset classes. 
[Michael Schnell] 

This of course triggers my attention :) .

RemObjects (the "original" basic product not involving Database ) allows for creating Object Pascal classes that are synced via a transport layer (that can be TCP/IP or various other options). 

With Pas2JS obviously syncing classes between a Browser based part of a program and a server based part via WebSockets seems extremely interesting...

-Michael