Add Swift Package Manager sources

Update Swift version to 3.7b2

Fix iOS build

Add Visual Studio 2019 NuGet packaging files

Another fix for Slice/errorDetection

Missing quotes

Update JAR version to 3.7.1-1

PyThread_get_thread_ident returns unsigned long in Python 3.7 and lon…

…g in older versions

Ice v3.7.1

Fix ICE-8579 - PHP 5.3 build failure with GCC 6