Veyon 4.3.5

[tobydox]

We're happy to announce Veyon 4.3.5, the fourth maintenance release of Veyon 4.3.x:

• LDAP: make SSL/LDAPS connections work properls (previously broken due to improper certificate verifications)
• LDAP: enable additional low-level debug messages at the command line via environment variable VEYON_DEBUG_LDAP_LIBRARY
• Update 3rdparty component libvncserver to latest 0.9.13 snapshot (including new unified connection timeout handling support)
• Master: limit update interval to 10 seconds to prevent server timeouts
• Windows: update libraries (Qt 5.12.8 snapshot, OpenSSL 1.1.1g)
• Windows: update 3rdparty component UltraVNC (memory leak and other non-critical fixes)
• Fix build with Qt >= 5.14
• Minor code modernizations
• Update translations