When copying assets, need to recursively recreate folder structure

[NQNStudios]

What happened

A file system error on Windows when putting assets inside nested folders in the Assets directory.

Steps to reproduce

Make a new story. Create a folder inside the assets directory, and put another file in there. Then compile.

Expected behavior

All folders inside the assets folder should be copied into the output location. Instead, they cause an error.

[invicticide]

I did this:

fractive create examples/nested
cd examples/nested/assets
echo foo > foo
mkdir nested
cd nested
echo bar > bar

Then I compiled the project, and it appears to have worked just fine. Tested in both Windows 7 and OSX.

@NQNStudios What was the specific file system error you got?

[invicticide]

Oh never mind, it looks like this only reproduces if assets contains only folders, no files, at its root level. Looking into a fix now.