Turn off debug output

At some point would be nice to turn off the debug output - or make optional. It's useful stuff, so not suggesting just deleting.

```python
>>> pycam = adafruit_pycamera.PyCamera()
FutureWarning: FourWire moved from displayio to fourwire
FutureWarning: Display moved from displayio to busdisplay
FutureWarning: Display renamed BusDisplay
reset camera
pre cam @ 0.333008
I2C addresses found: ['0x19', '0x58']
Found AW9523
sdcard done @ 0.399414
Initializing camera
Found camera OV5640 (240 x 176) at I2C address 3c
camera done @ 1.19922
['__class__', '__enter__', '__exit__', 'address', 'ae_level', 'aec2', 'aec_value', 'agc_gain', 'awb_gain', 'bpc', 'brightness', 'colorbar', 'contrast', 'dcw', 'deinit', 'denoise', 'exposure_ctrl', 'frame_available', 'frame_size', 'framebuffer_count', 'gain_ceiling', 'gain_ctrl', 'grab_mode', 'height', 'hmirror', 'lenc', 'max_frame_size', 'pixel_format', 'quality', 'raw_gma', 'reconfigure', 'saturation', 'sensor_name', 'sharpness', 'special_effect', 'supports_jpeg', 'take', 'vflip', 'wb_mode', 'whitebal', 'width', 'wpc']
colors 16777215
colors 16777215
init done @ 2.13428
>>>
```