Use -literalPath to avoid problems with paths that have square brackets (and other special characters)

This reverts merge request !7657

This reverts merge request !7653

Compel UTF8 encoding so the powershell trick works even with files that don't have valid names in the current codepage

This allows us to escape the SugarCube eval() environment and write
normal JavaScript without assigning to the window object.

This reverts merge request !5896

This allows us to escape the SugarCube eval() environment and write
normal JavaScript without assigning to the window object.