Create macro for getters and setters

[aashish24]

Currently we do this:

foo.setBar(10);
foo.setLength(20);
foo.bar()

Instead we want to do this:
foo.bar(10).length(20);

But we don't want to write each function where we would have to check
for the argument.

[cjh1]

This is related to existing geoweb issue #213

[aashish24]

I guess we don't have a very good solution for this? If that's the case I am closing this for now.