UI: improve keyboard navigation

[thfries]

Keyboard navigation can be improved in the UI.

Observed issues:

• tables should support up and down keys to navigate in things, features and most of all: messages and log entries
• tab navigation in the input areas is not working
  • order of input fields in the different CRUD editors is not considered
  • esc key should work to cancel a CRUD editor
  • enter key should work to trigger create or update in a CRUD editor
  • same for the send message UIs: navigate with tab in the different input fields and enter key to trigger send
• introduce hotkeys to switch tabs, e.g. to switch details and manage and message

Implementation note for the table keys: Optionally a refactoring would make sense for all the tables: create a web component for the tables and move all table related functions from Utils to this new component. Solve the key navigation in this new component. May be that is worth a separate ticket.