Case insensitive --map-syntax (#2650)

Co-authored-by: Nicolas AMBRY <nicolas.ambry@atos.net>

src/syntax_mapping.rs

@@ -211,7 +211,7 @@ impl<'a> SyntaxMapping<'a> {
 
     pub fn insert(&mut self, from: &str, to: MappingTarget<'a>) -> Result<()> {
         let glob = GlobBuilder::new(from)
-            .case_insensitive(false)
+            .case_insensitive(true)
             .literal_separator(true)
             .build()?;
         self.mappings.push((glob.compile_matcher(), to));