1. Add spinner button and logic when waitting for account created to
prevent reclicking the buttons
2. Add back button when creating accounts in main view.
3. Fix the look up username bug
4. Change some buttons to blue styled
5. Change back button to back arrow
6. Add autofocus when entering certain page
Gitlab: #59
Change-Id: I3cada8c07a6605f091001db75a2913cde379c41b
Partially optimized the wizardview related UI code and UI performance.
Note: Since some common components are changed, UI changes in settings
view are also required to keep the original style.
Gitlab: #59
Change-Id: Ib77868bac3a6479700e81f3361b67a8403725661
