Run conan on windows

scripts/build-windows.bat

@@ -1,5 +1,9 @@
 cd %BUILD_DIR%  || exit /b
 
+if exist ../conanfile.py (
+  conan install ..
+)
+
 %CMAKE_DIR%\cmake -DDEPENDENCY_TOKEN=%DEP_SECRET% -DCRASHDUMP_SECRET=%CD_SECRET% -DCMAKE_BUILD_TYPE=RelWithDebInfo -DCMAKE_INSTALL_PREFIX=output -DDEPENDENCY_UNTAR_DIR=c:\jenkins\pmp-deps .. -G Ninja -DCODE_SIGN=ON -DENABLE_CODECS=on || exit /b
 
 ninja || exit /b