[PatrykMis]

This adds support for the modified Inno Setup variant identified by:

AiR Setup Setup Data (5.2.0)

The variant is based on Inno Setup 5.2.0, but its main setup header contains two additional length-prefixed strings after AppModifyPath, apparently used for the skin and music filenames.

Without accounting for these fields, the parser becomes misaligned before LeadBytes and the subsequent entry counts. In the affected installer this eventually causes directory_count to be interpreted as an extremely large value, resulting in std::bad_alloc.

This change:

• adds an Air version flag,
• recognizes the original AiR Setup Setup Data (5.2.0) signature,
• consumes the two additional binary strings before continuing with the standard Inno Setup 5.2.0 header layout,
• keeps version comparisons and the rest of the 5.2.0 parsing logic unchanged.

The additional strings are parsed dynamically rather than skipped using a fixed byte count, so different skin or music filenames remain supported.

Fixes upstream dscharrer#125

[crazy-max]

thanks