Implementing Windows install support

[dkisselev]

I'm working on seeing if it's possible to tweak the project to add working (but perhaps unsupported) Windows compatibility.

The first barrier I'm working on is the Composer install scripts.

Is there any technical reason why you're copying the multi-select scripts but symlinking ajaxorg?

I'm tweaking the post-install to use 'php -r' and its built in functions instead of system-specific variants, but there's no equivalent call for 'ln -nfs', so I think that can be swapped out for a recursive copy if there isn't some other limitation.