UX review 1.4-pre2

[bcardiff]

Pending design things as from 1.4-pre2

• [x] Make 'Add Step' button appear on hover.
  • [x] Remove notion of selected action (toggleable light blue state)
  • [x] Add enough space for that button
• [x] Increase the space at the end of loop/if action in order to hence the scoping arrow
• [x] Add a '-' button to remove fields of open structs in hub actions in the left hand side
• [x] Make hub fields name editable as table columns
• [x] Remove textbox in add hub field button when the fields are editable
• [x] Select the field name in editable mode when a new field was added in the hub action. (Same as new column in data table)
• [x] Change the add field button to a icon '+' with text
• [x] Make the add field button appear only on hover