SQM-1 - Created a unified alias registry

[dreab8]

https://hibernate.atlassian.net/browse/SQM-1

[sebersole]

Some of these are not alias declarations, but alias uses. I'll add specific in-line comments

[sebersole]

Also, notice that the license here is Apache License, not LGPL. Fix your file headers

[sebersole]

This usage is in fact declaring an alias, but its intent is not to be reusable in other parts of the query. The intent for being able to alias dynamic instantiation arguments is to potentially allow these to name JavaBean-style property names for setter injection rather than needing to use ctors strictly.

[dreab8]

@sebersole
Fixed the PR based on your comments.
Thanks

[gunnarmorling]

@sebersole, @dreab8 What about this one? Can it be merged?

[sebersole]

I do not like the way this is done, specifically in regards to defining it in the grammar and then handling it in the generated listener/visitor. The problem is "other" listener/visitor impls would cause false positive "collisions". I will push some minor changes on top of this PR shortly.

[sebersole]

Ok, I applied this to master along with my minor change