MVC-UI : update AppView
MVC-UI : update AppPanel
MVC-UI : update HeaderPanel
MVC-UI : update ContentPanel
MVC-UI : update SearchBarPanel
MVC-UI : update SearchBarField
MVC-UI : update SearchButton
MVC-UI : update ListTweetPanel
MVC-UI : update TweetPanel
MVC-UI : update Main
Merge branch 'UI-implementation' into develop