Replaced the old Ionic.Zip library for the most recent DotNetZip one (1.15.0). Fixes some edge-case bugs some people were experiencing.

Fixed situation where in certain scenarios password-protected ZIP archives became unprotected after being opened.

Complete overhaul, focusing on working with disk-based ZIP files.

• Renamed actions using noun-verb names (instead of the old verb-noun), also clearly indicating the difference between actions using memory as input or output, and those that use disk;
• Described all actions and parameters in a consistent manner;
• Removed action GetZipBinary to retrieve the ZIP archive binary (we're working with large, disk-based ZIP archives after all);
• Added action FileGetPath to extract the contents of a file directly to disk (allowing for large files to be extracted without much memory overhead);
• Expanded the number of attributes returned by ZipFileListGet (the old GetFiles), including compression ratio and various time stamps;
• Removed the IsBig parameter in ZipCreate (the old CreateZip), ZipLoadMemory (the old LoadZip) and ZipLoadPath (the old LoadZipPath), big mode (i.e. disk-based mode) is now always used;
• Replaced the WinZip icons with a new set;
• Included the latest version of the Ionic.Zip library.

All of the above means there are many breaking changes with previous versions, so update carefully.

Small corrections.