Fixed BuildTargetWindows not copying all files from Compiled folder
Fixed 'Use legacy compiler' being totally broken
Fixed hard link code for non-admins

Previously an error was being raised if a non-admin attempted to change
the security permissions for some files. Instead these permissions are now
set all at once after compilation is completed (AGSEditor.cs, ln 951).
This should attempt to raise a UAC prompt if needed, and will just
silently fail to set permissions on error.
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