BREAKING CHANGE(core): Refactor contact and PDF handling across the library by replacing IContact with TContact and updating PDF processing to use a structured IPdf object. These changes ensure that empty contact objects include registration details, founded/closed dates, and status, and that PDF loading/exporting uniformly wraps buffers in a proper object.

ts/00_commitinfo_data.ts

@@ -3,6 +3,6 @@
  */
 export const commitinfo = {
   name: '@fin.cx/xinvoice',
-  version: '1.3.3',
+  version: '2.0.0',
   description: 'A TypeScript module for creating, manipulating, and embedding XML data within PDF files specifically tailored for xinvoice packages.'
 }