#1. Removing yaml syntax in batch file for windows ci. Adding line continuations to batch file.

ci/windows_testing.bat

 set PATH=c:\Qt\5.9.1\msvc2013_64\bin;%PATH%;c:\Program Files (x86)\NSIS\Bin;c:\vendors\cl\libssh\0.9.3\bin;c:\vendors\cl\openssl\1.1.1d\bin
-'call "c:/Program Files (x86)/Microsoft Visual Studio 12.0/VC/vcvarsall.bat" amd64'
+call "c:/Program Files (x86)/Microsoft Visual Studio 12.0/VC/vcvarsall.bat" amd64
 where git
 git --version
 git submodule init