CI/CD: Correct the folder for the MS-Windows package

Ammar Nejatirequested to merge
WindowsPackage into develop

The NSIS package includes all the required applications, examples, headers and libraries (separate .dll or .exe files are not needed).

The NSIS build folder is set to build/winpackage to avoid littering the main build directory.

The artifact paths are corrected to avoid the warnings at the end of the GitLab-Runner build log:

WARNING: build/bin/Release/*.dll: no matching files
WARNING: build/bin/Release/*.exe: no matching files

Related to #133 (closed)

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