Build tool: ensure code signature on all OSX bins.
Make OSX ZIP packages with ditto, to preserve file attributes.
Use ditto when unpacking a new release, to make sure exnteded attributes are kept.
Remove symlinks in node_modules when building ZIPs.
Handle HiDPI screens in Linux alert (new SystemFlash).
Fixes to alerts in non HiDPI Linux systems.
Final fixes to Linux alert spacing and heights.
Updated shebangs for OSX/Linux alerts.