Patch diff with ignore white space

When creating a patch diff using Diff.Compare I did not find any option to ignore white space.

I think CompareOptions should contain an enum corresponding to the git diff settings:

--ignore-all-space
--ignore-space-change
--ignore-space-at-eol

Currently there is a WhitespaceMode in SimilarityOptions. However, this is intended for handling white space while detecting renames and copies.

I intend to submit a pull request for this.

Version of LibGit2Sharp

4de700fe

从 Diff.Compare 和 CompareOptions 入手，然后将它们与 SimilarityOptions 及其现有的 WhitespaceMode 进行比较。检查列出的三个 Git 空白设置如何映射到比较路径；完成标准是 Compare 支持这些模式，并且测试验证每个设置。