[Feature Request]: Restore textures and sounds from `imported` resources

[DmitriySalnikov]

Feature description

Convert the reading algorithm to read ctex and oggstr and possibly other formats and save them in the usual formats.

Implementation Ideas

Before extraction, add a checkbox to specify whether to restore imported files and if it is checked, then after export read .import files and try to find imported resources. If such resources are found, read their contents and convert them to familiar formats. The .import file seems to need fixing too.