NXP-12091: Allow providing credentials for an authenticated proxy
NXP-12063: Handle proxy exceptions
NXP-12091: AES encrypt proxy password for (binary) storage
NXP-12091: Remove proxy password from DeviceConfig representation
NXP-12091: Fix "IV must be 16 bytes long" crypto issue
NXP-12680: Externalize proxy handler computation
NXP-12680: Cosmit
NXP-12680: Reorganize application.py
NXP-12680: Reorganize controller.py
NXP-12680: Merge authentication and proxy settings dialogs into a single tabbed dialog box
NXP-12091: Update DEVELOPERS with PyCrypto installation
Merge branch 'feature-NXP-12680-tabbed-settings-dialog'