XTool - Successor of ZTool

[Razor12911]

Update available

Changes

- updated unity engine support for closely packed files
- older zstd libraries now supported

Notes

A sample of Unity is included in the attachment in "xtool_v06.7z\FA_example\pack", check via Hex as to how the headers should look like.

Don't use lz4 with other codecs when packing FC5 at the moment to avoid errors, work incomplete.

If you're planning to use zlib codec, use version 0.5's, I only remembered now after upload that I was doing something to it last night and might result in errors.