Remove the GetStandardProperties trait.

This was using dynamic dispatch to deal with enums to avoid the repetitive typing.

src/compare/diff.rs

@@ -57,7 +57,6 @@ use crate::types::FixedWidthArea;
 use crate::types::FootnoteDefinition;
 use crate::types::FootnoteReference;
 use crate::types::FootnoteReferenceType;
-use crate::types::GetStandardProperties;
 use crate::types::Heading;
 use crate::types::HorizontalRule;
 use crate::types::Hour;
@@ -413,7 +412,7 @@ pub(crate) fn compare_ast_node<'b, 's>(
             name: rust.get_elisp_fact().get_elisp_name(),
             message: Some(e.to_string()),
             children: Vec::new(),
-            rust_source: rust.get_standard_properties().get_source(),
+            rust_source: rust.get_source(),
             emacs_token: emacs,
         }
         .into()

src/compare/util.rs

@@ -15,7 +15,6 @@ use crate::compare::sexp::unquote;
 use crate::types::AffiliatedKeywordValue;
 use crate::types::AstNode;
 use crate::types::GetAffiliatedKeywords;
-use crate::types::GetStandardProperties;
 use crate::types::StandardProperties;
 
 /// Check if the child string slice is a slice of the parent string slice.
@@ -44,14 +43,14 @@ fn get_rust_byte_offsets<'b, 's, S: StandardProperties<'s> + ?Sized>(
 pub(crate) fn compare_standard_properties<
     'b,
     's,
-    S: GetStandardProperties<'s> + GetElispFact<'s> + ?Sized,
+    S: StandardProperties<'s> + GetElispFact<'s> + ?Sized,
 >(
     original_document: &'s str,
     emacs: &'b Token<'s>,
     rust: &'b S,
 ) -> Result<(), Box<dyn std::error::Error>> {
     assert_name(emacs, rust.get_elisp_fact().get_elisp_name())?;
-    assert_bounds(original_document, emacs, rust.get_standard_properties())?;
+    assert_bounds(original_document, emacs, rust)?;
     Ok(())
 }