Add Windows deploy stage to GitLab CI.

ci/nsis_build.bat

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+REM - Run the full testsuite;  tests\testament\tester all
+
+REM - Uncomment the list of changes in news.txt
+REM - write a news ticker entry
+REM - Update the version
+
+REM - Generate the full docs;  koch web0
+REM - Generate the installers;
+REM - Update the version in system.nim
+REM - Test the installers
+REM - Tag the release
+REM - Merge devel into master
+REM - Update csources
+
+set NIMVER=0.14.3
+
+Rem Build -docs file:
+koch web0
+cd web\upload
+7z a -tzip docs-%NIMVER%.zip *.html
+move /y docs-%NIMVER%.zip download
+cd ..\..
+
+Rem Build .zip file:
+rem koch csources -d:release
+rem koch xz -d:release
+rem move /y build\nim-%NIMVER%.zip web\upload\download
+
+ReM Build Win32 version:
+
+set PATH=C:\Users\araq\projects\mingw32\bin;%PATH%
+cd build
+call build.bat
+cd ..
+nim c koch || exit /b
+koch boot -d:release || exit /b
+cd ..\nimsuggest
+nim c -d:release --noNimblePath --path:..\nim  nimsuggest || exit /b
+copy /y nimsuggest.exe ..\nim\bin || exit /b
+cd ..\nim
+koch nsis -d:release || exit /b
+move /y build\nim_%NIMVER%.exe web\upload\download\nim-%NIMVER%_x32.exe || exit /b
+
+
+ReM Build Win64 version:
+set PATH=C:\Users\araq\projects\mingw64\bin;%PATH%
+cd build
+call build64.bat
+cd ..
+nim c koch || exit /b
+koch boot -d:release || exit /b
+cd ..\nimsuggest
+nim c -d:release --noNimblePath --path:..\nim  nimsuggest || exit /b
+copy /y nimsuggest.exe ..\nim\bin || exit /b
+cd ..\nim
+koch nsis -d:release || exit /b
+move /y build\nim_%NIMVER%.exe web\upload\download\nim-%NIMVER%_x64.exe || exit /b