Support for closure, if and loop for inline groovy script in set filed of action tag.

Currently, we can use inline groovy script in set field tag of action tag in screens and forms. like
<form>
<action>
<set field="tempVar" value="${groovy: someList?someList.size():0;}"/>
</action>
</form>
But, we can not use closure, if or loop in this kind of inline groovy. like
<form>
<action>
<set field="tempVar" value="${groovy: str=''; someList.each{str=str+it}}"/>
</action>
</form>

The reason is that matching closing } braces for any opening { braces in the script are ignored and script does not get compiled if it contains any set of

{ and }.


So, I have added a patch which makes it possible to use closure, if and loop by handling { and }

braces occurs with in the script.