feat: add xml validation tool (#525)
* feat: add xml validation tool
The introduced tool allows to validate XML data against a XSD schema.
Refs: #171
* fix: revert manifest changes
* fix: remove 'validate' button
* feat: use standard info dialog
* chore: delete unused assets
* refactor: delete unused code
* feat: add new tool icon
* feat: add 'enable nullable' directive
* feat: adjust accessibility levels
* refactor: apply code convention
* feat: display info bar at startup
* fix: adjust overlay view layout
* feat: support SmartDetection
* fix: validation execution
* fix: remove unnecessary localization
Co-authored-by: davidTigris <45315755+davidTigris@users.noreply.github.com>
Co-authored-by: davidTigris <davidTigris 45315755+davidTigris@users.noreply.github.com>
