Support saturation & contrast

[Slider0007]

Add saturation & contrast support --> #1851

• Add workaround for cam library to support saturation and contrast
  --> Not all requested functions are enabled even if called because bitwise OR logic of the ENABLE BYTE is missing in library. Only latest enable is active. Now registers are written directly to enable neccessary bits. Newer versions of cam library still have the same issue, so same library version is used
• Add additional error handling to ClassControllCamera
• Refactor ClassControllCamera.cpp
• edit_reference.html: Use correct value for contrast setting (saturation value was used before)
• Limit image quality index to 8...63 to prevent against instabilities at too low values (no change to default value: 12)
• edit_config_param.html: Adapt parameter quality index, saturation and contrast to changes in firmware

Questions:

• Any concerns about this workaround?
• Any concerns changing the lower limit of quality index from 0 to 8?

[jomjol]

To your questions

1. no concerns - only one question: do we have to take something into account, when we update the esp32cam library?
2. fine for me!

For me you can remove the draft status.

[Slider0007]

1. no concerns - only one question: do we have to take something into account, when we update the esp32cam library?

It should be not critical to update the library because the same registers get written than the library do.

[Slider0007]

@jomjol: We should highlight this change somehow on the changelog because this could have impact on existing camera configurations.

[jomjol]

Done in the changelog from the rolling