Implement the move operators and copy construtor

Almost all the init() functions are gone and we just have simple
constructors now

Also made free() public since you're not supposed to call it anymore,
unless you're being evil and malloc'ing Objects like Array/Dict/XRef

This has a huge reaction chain, most importantly we
don't get objects by passing a pointer Object parameter, we
just get the object as a return value, which is a much clearer API
 -  aobj->copy(&obj);
 +  obj = aobj->copy();
before I was never sure what was being copied into what

Comes with a huge diff, I probably made some mistake in the porting
since there was lots of copy & paste involved