Fix Android build

Remove unused FlightGear stuff
More work
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Windows build updates
Linux fixes
Fix unit test run directory

More work

Get XCode build working again

Fix for creation of OSX App XCode Project

Use 64 bit versions of vc runtime

Add missing install lib

Fix lib path

Android OpenSSL support

Move to 64 bit, MSVC 2017

Revert change causing startup to fail

Also copy all dependencies of ICU libs to cover all configurations

Link to any found version of libicu.

Add test for an existing window before attempting to close it.

Attempt at producing a distributable binary (failed because of OpenSSL dependencies)