Windows 10 support

[s0ds0ds0d]

Environment: Win10, VisualStudioCode, PowerShell(admin), node.js present

Steps to reproduce:

1. New folder, VSC with terminal: "figplug init -ui MyPlygin"
   Output: files generated in folder MyPlugin and its ok.
2. Run in terminal: figplug build -w
   Output: script is looking for folder called "C"
   "figplug: Error: ENOENT: no such file or directory, stat 'C:\Users\s0ds0ds0d\Documents\MyPlugin\C'"
   Workaround: create new folder called "C" inside plugin folder (../MyPlugin/C) and copy all files from MyPlugin/ to C/
   Now when you run: figplug build -w it works but it behave in different way on macOS