fix: check pom properties for version (#1251)

[chtompki]

I think this closes #1251. I'm not sure but there may be an analogous issue with gradle. I'll see if I can find and example and submit a similar fix.

[chtompki]

@kzantow - I think that last commit accomplishes what you're looking for. Let me know

[kzantow]

@chtompki -- if you'd like, I can make a couple small updates to this that I think will get it to the finish line

[chtompki]

Go for it. I'm curious to see what you do. I'll learn from that and try to use that style for any future PRs I submit

[kzantow]

@chtompki thanks -- I went down a little bit of a rabbit hole that I wouldn't expect most people to do in order to support project properties like ${project.parent.groupId}, which I've seen used enough to justify adding support for this while we're touching the property resolution. I've used some reflection for this because the gopom library has appropriate xml tags to make this fairly generic processing. We still need a solution for resolving parent and dependency poms, as well as dealing with dependencyManagement, but those aspects are both outside the scope of this change, I think.

[chtompki]

Cool...I see what you've done here, and that helps me think about the way I might make an analogous change for gradle. I don't have a good example for gradle yet, and I've only seen it once. But, I'm thinking about trying to make that my next contribution