feat(core): Added new method getEnvVarOnDemandStrict to throw error for unset env vars

ts/00_commitinfo_data.ts

@@ -3,6 +3,6 @@
  */
 export const commitinfo = {
   name: '@push.rocks/qenv',
-  version: '6.0.8',
+  version: '6.1.0',
   description: 'A module for easily handling environment variables in Node.js projects with support for .yml and .json configuration.'
 }