Fix for build on Windows (double-quotes in OpenSCAD build commands are stripped out by cmd)

Rowan Walshrequested to merge
rowan-walsh/openflexure-microscope:compiling-on-windows into improve-string-quoting-on-windows-builds

To work on Windows, the build commands for OpenSCAD need double-quotes around the parameters and escaped double quotes within the parameters. Otherwise the double-quotes inside string params passed to OpenSCAD are stripped out when the command is run. This adds a check for Windows when building the parameter strings.

Generated for bash (unchanged): openscad --hardwarnings -D 'VERSION_STRING="58d3b45"' openscad/main_body.scad

Generated for cmd (added): openscad --hardwarnings -D "VERSION_STRING=\"58d3b45\"" openscad/main_body.scad

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