Add initial Inno Setup 6.5.0 support

[rhcp011235]

Summary

• add initial support for Inno Setup 6.5.0 installers
• handle revision-2 loader offset tables and the 6.5 setup encryption header
• parse 6.5 ISSig key entries, file entries, file-location entries, and wizard/plugin trailer data
• recognize 6.5.0 in version detection and update the advertised supported version range

Validation

• built the updated extractor locally in the current workspace
• verified innoextract -i succeeds on HMT Keys Generator setup v2.01.exe
• verified innoextract -l succeeds on the same installer
• verified fresh extraction succeeds on the same installer and materializes 76 installed files

Notes

• this is still an initial support patch and does not add automated fixtures/tests yet
• one string-decoding warning is still emitted on the validation sample, but listing and extraction complete successfully

[rhcp011235]

fixed