Feature update, sucurity and bug fixes

New features:

• New role 'assistant admin' implemented
• Team calendar maintenance implemented

User stories done:

• Do not show a node selection event when selecting the context menu to prevent overwriting a warning message from the context menu
• Show dependencies/conditions in the tree view when context menu item "Show/remove dependencies/conditions ..." is selected
• Show dependency violations in a special sidebar (and remove indicator from the item title)

Security

• Upgrade Axios for fixed vulnerability

Bug fixes:

• Fix for setting options of teams without members