Add initial support for session creation
Add copyright header
Add session tab to editing mode
Show confirmation dialog when leaving editing mode only if there are
changes
Do not open multiple tabs for the same question
Coding style

Fixed indentation for consistency.
Improve layout of new session dialog
Localize session/question creation and editing
Remove tab from array when closed on question creation/update
Reload question list after question creation/update
Switch to new session after creation
Show add session button only in editing mode

The add session button replaces the QR button in editing mode.
Do not load answers in editing mode
Remove obsolete debug output
Coding style

Replaced unnecessary switch with if.
Add hash URL for direct access to the lecturer's panel of Mobile