test_icon.c: internal refactoring of test_icon example.
test_icon.c: internal refactoring of test_icon example.

Now it looks like a normal efl app.
- Declare variables at the start of the function.
- Resize and show the window right after its creation.
- Set widgets' parents properly.

FlorentRevest/Elementary,rvandegrift/elementary,tasn/elementary,tasn/elementary,rvandegrift/elementary,tasn/elementary,rvandegrift/elementary,rvandegrift/elementary,FlorentRevest/Elementary,tasn/elementary,FlorentRevest/Elementary,tasn/elementary,FlorentRevest/Elementary