Add workaround cast for Eclipse TypeScript
Add very basic user sessions
Add SessionInfo + Immediate UI updates on login/logout
Clear userInfo in client on logout, to prevent timeout alert
Add number of sessions to SessionInfo and show on page
Move file path constants to Config.ts
Move all configuration constants to Config.ts
Rename file import to File, for consistency
Refactor + Don't crash on config-file read error

We will notice the error since no short-/midrange antennas will be shown in the server status area.
Read user data from ~/lucy/config/users.json
Log login/logout activity