Support for splitting archive

[webjib]

As minizip is supporting splitting zip archive, I've added a way to create archive with user-defined disk size. A disk size of 0 means we're using old open function. I've also added a size check to avoid creating parts of less than 1 KB (useful ?).

[Coeur]

Nice feature.
But we can't change the signatures of createZipFileAtPath::: and open like that: we need to keep a compatibility layer, which I can easily write eventually.

[webjib]

You're completely right, I should have kept previous signatures. I've made a new commit to restore them.

[jhudsonWA]

I'll take a look at this after the holidays. Just want to let you know you were not forgotten. Thanks for the PR.

[jhudsonWA]

Working on updating the included upstream minizip library to version 2, then I'll visit this one some more.

[zhouJinYing]

Nice feature.
But we can't change the signatures of createZipFileAtPath::: and open like that: we need to keep a compatibility layer, which I can easily write eventually.

你好，请问为什么不能暴露这个方法呢？是有其他的影响吗？如果要使用split的话，需要如何使用呢？直接在zip.c文件中修改ziinit.disk_size值吗？谢谢！

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[edit: Google Translate]

Why can't you expose this method? Is there any other impact? If you want to use split, how do you use it? Modify the ziinit.disk_size value directly in the zip.c file?

[Patr0ck]

Wondering if you have any plan on merging this one...

[willson-chen]

Thanks for the PR. If you can add some testcases we will merge in v3.0