Dev. Preview 7a

Hi. This update fixes some bugs and improves performance.

• The list of applications has been redesigned.
• Now if the search is running and the user returns to the home screen, the search will be turned off
• Added application loading indicator in OOBE (same as in Start menu)
• Slightly improved list loading performance (I guess)
• If the user removes all letters when changing the application name, a small hint in the form of the real application name will be visible. If the user enters nothing and tries to save the value, the real application name will be set
• New apps can now be pinned anyway (previously they could replace other apps)
• Other minor changes