TT's ZipPackage updated for next Xojo release

Xojo Beta testers notified me that the next Xojo release might remove a few deprecated functions. I’ve updated my zip classes occordingly so that they compile with the latest betas again:

Note that the code still uses the deprecated function “FolderItem.MacType” in OSX builds, because there is no replacement given. Fortunately, this function is still available in the most recent betas. Let’s hope it stays that way.