eMule_v0.50b-unofficial: .: Fixed: minimize to tray after display scaling change

.: Fixed: minimize to tray after display scaling change
.: Fixed: checks for null pointers in Kademlia code
.: Fixed: after initial bootstrap KAD contacts list stopped updating (regression)
.: Changed: expanded tooltip to 128 characters
.: Changed: reuse source exchange socket for downloading (thanks to Enig123)
.: Changed: minor dialogs optimizations
.: Removed: unused HyperTextCtrl.* files