Update trainermenu.cpp

avatar selection
Update trainermenu.ui

avatar selection
Create avatardialog.cpp

created
Create avatardialog.h

created
Create avatardialog.ui

created
avatar selection

added dialog for easier selection of avatars
Update avatardialog.ui
Update trainermenu.ui
Update avatardialog.ui
Merge pull request #1096 from SongSing/master

Avatar Selection Dialog