Updated ChangeLod, README and nsis script.

- corrected default values for I/O
- fixed bug when resetting I/O pins
- upgraded version in CMakeLists and .pro file

Set implicit width of spinboxes

Providing also an application icon.

Windows USB installer has own repo and is deleted from here.

The application version number is once defined in CMakeLists.txt
and passed to the preprocessor.

Added the NSIS script and other needed files for creating a windows
installer.
Extended the README with information on building the app on Windows.

- Plus: changed variable type for time_exposure

- Modifications for variable types not supported in the newest Opencv 4 lib
- Corrected the display of the green channel pixel value
- Small correction in histogram visualization

- Added the application name to all child windows titles
- Corrected the release date assingment
- Changed alignment in "About" and "Camera infos"
- ROI is disabled when applying binning

import from github