add helper tool to simplify new stubs creation
add stub for ppb_buffer_dev
add stub for ppb_char_set_dev
add stub for ppb_cursor_control_dev
add stub for ppb_file_chooser_dev
add stub for ppb_file_chooser_trusted
add stub for ppb_file_ref
add stub for ppb_flash_clipboard
add stub for ppb_flash_file_file_ref
add stub for ppb_flash_font_file
add stub for ppb_flash_menu
add stub for ppb_ime_input_event_dev
add stub for ppb_memory_dev
add stub ppb_net_address_private
add stub for ppb_tcp_socket_private
add stub for ppb_udp_socket_private