Change system File Creation Mode for multi-user access

Overriding the File Creation Mode set by umask on Linux allows FW to create
directories and files with the permissions needed for group write access in
/var/lib/fieldworks. Safely resets the umask after creating files.
Completion of fix for FWNX-1002.

Change-Id: I6da15cc9aefd18f3bfb83a74c42db70fff9949b5
fix windows compilation error

Feature/FWNX-1002 caused build error on windows

Change-Id: Ia2365031a7bdfc7647e9b837c63044cc47290719
Merge branch 'support/7.3-gial-Linux' into develop

Conflicts:
	Lib/src/icu
	Src/Utilities/BasicUtils/BasicUtils.csproj

Change-Id: I4ec1aa194e9a90fd91626cbcf0f12aabcf9a0713