Add missing stdio.h for usage of filestream functions

Signed-off-by: Olliver Schinagl <o.schinagl@ultimaker.com>
Remove \r from CuraEngine

CuraEngine uses newline's, not carriage return's. This patch strips \r's
from the source files. No code changes where performed.

Signed-off-by: Olliver Schinagl <o.schinagl@ultimaker.com>