Put configuration values together

[klanderfri]

The program has literals that are of a configurative nature. Regard the code below:
do {
threshold(workOriginal, binaryImage, binaryThreshold, 255, THRESH_BINARY);
binaryThreshold -= 20;
} while (!ImageHelper::IsBlackTextWhiteBackground(binaryImage) && binaryThreshold > 0);

The 255 and the 0 are literals, and should be so. The 20 however might need to be changed in the future since it is a literal that might need to be configured.

• Compile all configurative values in one single class.

In the future it might be useful to load these values from an external file which the user can edit (if needed).