add retrained self-make mnist model, and set it to default model

Author: windwood-xmu

cnn_models/mnist.pb

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cnn_models/mnist.txt

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-{}
+{"mnist": {"image_width": "128", "status": 1, "image_height": "128"}}

cnn_models/models.json

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-{"move_power_angle_3": "60", "cnn_default_model": "fruit_025_128_1", "prog_maxblocks": "-1", "camera_jpeg_quality": "5", "show_page_control": "true", "camera_framerate": "30", "prog_scrollbars": "true", "move_fw_speed": "100", "prog_level": "adv", "move_motor_trim": "1", "move_motor_mode": "dc", "cv_image_factor": "2", "move_power_angle_1": "45", "camera_path_object_size_min": "4000", "button_func": "none", "camera_color_object_size_min": "4000", "camera_jpeg_bitrate": "1000000", "move_fw_elapse": "1", "show_control_move_commands": "true", "camera_color_object_size_max": "160000", "show_page_prefs": "true", "camera_exposure_mode": "auto", "ctrl_tr_elapse": "-1", "show_page_program": "true", "move_tr_elapse": "0.5", "camera_path_object_size_max": "160000", "sound_shutter": "$shutter.mp3", "ctrl_fw_elapse": "-1", "sound_stop": "$shutdown.mp3", "ctrl_tr_speed": "80", "ctrl_fw_speed": "100", "move_tr_speed": "85", "move_power_angle_2": "60", "ctrl_hud_image": "", "load_at_start": "", "sound_start": "$startup.mp3"}
+{"cnn_default_model": "mnist", "show_control_move_commands": "true", "prog_level": "adv", "ctrl_tr_speed": "80", "camera_exposure_mode": "auto", "camera_framerate": "30", "sound_shutter": "$shutter.mp3", "camera_jpeg_quality": "5", "ctrl_fw_speed": "100", "move_motor_trim": "1", "sound_stop": "$shutdown.mp3", "move_power_angle_3": "60", "show_page_prefs": "true", "button_func": "none", "prog_scrollbars": "true", "ctrl_fw_elapse": "-1", "move_fw_speed": "100", "cv_image_factor": "2", "ctrl_hud_image": "", "camera_path_object_size_min": "4000", "show_page_program": "true", "move_motor_mode": "dc", "camera_jpeg_bitrate": "1000000", "move_power_angle_1": "45", "sound_start": "$startup.mp3", "move_power_angle_2": "60", "move_tr_speed": "85", "load_at_start": "", "camera_path_object_size_max": "160000", "camera_color_object_size_max": "160000", "show_page_control": "true", "prog_maxblocks": "-1", "move_fw_elapse": "1", "camera_color_object_size_min": "4000", "ctrl_tr_elapse": "-1", "move_tr_elapse": "0.5"}