Fix some simple cases of GTK2 deprecated API usage by using a renamed or equivalent API

Fix some simple cases of GTK2 deprecated API usage by using a renamed or equivalent API
  gtk_container_border_width()          ==> gtk_container_set_border_width()
  gtk_container_children()              ==> gtk_container_get_children()
  gtk_entry_new_with_max_length()       ==> gtk_entry_new(); gtk_entry_set_max_length()
  gtk_menu_append()                     ==> gtk_menu_shell_append()
  gtk_menu_prepend()                    ==> gtk_menu_shell_prepend()
  gtk_notebook_set_page()               ==> gtk_notebook_set_current_page()
  gtk_paned_gutter_size()               ==> gtk_paned_set_gutter_size()
  gtk_radio_button_group()              ==> gtk_radio_button_get_group()
  gtk_signal_connect()                  ==> g_signal_connect()
  gtk_signal_disconnect()               ==> g_signal_handler_disconnect()
  gtk_signal_emit_by_name()             ==> g_signal_emit_by_name()
  gtk_signal_handler_block_by_data()    ==> g_signal_handlers_block_matched()
  gtk_signal_handler_block_by_func()    ==> g_signal_handlers_block_by_func()
  gtk_signal_handler_unblock_by_data()  ==> g_signal-handlers_unblock_matched()
  gtk_signal_handler_unblock_by_func()  ==> g_signal-handlers_unblock_by_func()
  gtk_spin_button_get_value_as_float()  ==> gtk_spin_button_get_value()
  gtk_toggle_button_set_state()         ==> gtk_toggle_button_set_active()

git-svn-id: http://anonsvn.wireshark.org/wireshark/trunk@25634 f5534014-38df-0310-8fa8-9805f1628bb7