break/return/continue support in "Appended Block Closures" finally completed

[MG <mg...@arscreat.com>]

Hi,

I finally updated the incomplete Jira issue I created on supporting 
break/return/continue inside of closures: 
https://issues.apache.org/jira/browse/GROOVY-8301

(What stopped me initially was that when thinking about the two known 
approaches (using return or try-catch) - and how the both bend Closure 
semantics close to breaking point - I realized that support for inlining 
closures would trivially introduce break/return/continue support - and a 
bit later I saw that what I had thought about was exactly the way Kotlin 
does it...).

Cheers,
mg