Fix sample editing
Fix

Use unique UUID-based names for compiled sample sources
Feature

Implement conf-file-based authority management system
Fix AuthorityResolver method constness
Fix services
Improve locking
Update version
TeXSample Server v3.0.0-beta

* Fix sample editing
* Use unique UUID-based names for compiled sample sources
* Implement conf-file-based authority management system
* Fix services
* Improve locking