Begin removing the MyError type.

src/parser/object_parser.rs

@@ -4,7 +4,6 @@ use super::regular_link::regular_link;
 use super::subscript_and_superscript::detect_subscript_or_superscript;
 use crate::context::RefContext;
 use crate::error::CustomError;
-use crate::error::MyError;
 use crate::error::Res;
 use crate::parser::angle_link::angle_link;
 use crate::parser::citation::citation;