Support for INI Files

This commit adds constructs for evaluating contents of INI files to the independent schema. An INI file is a structured text file commonly used by OSs and applications, such as Microsoft Windows, PHP, and MIT Kerberos to store configuration information. While parsing INI files using regular expressions is often feasible, it often requires unnecessary complexity, which may be a barrier for authoring OVAL content. These schemas intend to reduce the complexity associated will collecting and assessing configuration states persisted in INI files. 

This work was sponsored by the Center for Internet Security. The schema enhancements were implemented by SecPod.