fix(core): Improve PDF XML extraction, embedding, and format detection; update loadPdf/exportPdf error handling; add new validator implementations and enhance IPdf metadata.

ts/00_commitinfo_data.ts

@@ -3,6 +3,6 @@
  */
 export const commitinfo = {
   name: '@fin.cx/xinvoice',
-  version: '4.1.5',
+  version: '4.1.6',
   description: 'A TypeScript module for creating, manipulating, and embedding XML data within PDF files specifically tailored for xinvoice packages.'
 }