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