Hydrophobic and Environment Resistant Properties of SiO$lt;inf$gt;2$lt;/inf$gt;/TiO$lt;inf$gt;2$lt;/inf$gt;/SiO$lt;inf$gt;2$lt;/inf$gt;-TiO$lt;inf$gt;2$lt;/inf$gt; Multilayer Antireflective Films at Wide Solar Spectra Range