*SECURITY* imroved TLS security; avoid indexing by search engines
- *SECURITY* main application page now contains a rule (header `X-Robots-Tag: noindex, nofollow`) to avoid being indexed by Google.
Rule can be removed by sets `ubConfig.application.customSettings.visibleForSearchEngines` to `true`
- *SECURITY* removed `X-XSS-Protection` header from main application page (deprecated by browsers, unsafe)
- *SECURITY* improvements in generated nginx config for HTTPS:
- removed support for TLS1.1 (remains TLS1.2 and TLS1.3)
- use a modern ssl_ciphers set
- added support for DHE/EDH and Forward Secrecy
- (Linux) added generation of DH params file if not exists; on Windows should be generated manually