minidom: Implement PartialEq manually for Node and Element

Move the NamespaceAwareCompare implementation from xmpp-parsers as Node
and Element's PartialEq implementation. Thanks Astro!

It's a lot more useful in tests to use `assert_eq!` than `assert!`, so
we get both items compared (left and right) instead of a "it failed."
message.

This "breaks" comparison for these two structs in the sense that it is
not strict object comparison anymore but it ensures that namespaces are
all present in the compared objects.

Signed-off-by: Maxime “pep” Buquet <pep@bouah.net>

xmpp-parsers/src/version.rs

@@ -41,7 +41,6 @@ impl IqResultPayload for VersionResult {}
 #[cfg(test)]
 mod tests {
     use super::*;
-    use crate::util::compare_elements::NamespaceAwareCompare;
     use crate::Element;
     use std::convert::TryFrom;
 
@@ -84,6 +83,6 @@ mod tests {
                 .parse()
                 .unwrap();
         println!("{:?}", elem1);
-        assert!(elem1.compare_to(&elem2));
+        assert_eq!(elem1, elem2);
     }
 }