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

從 Diff.Compare 和 CompareOptions 開始，然後將它們與 SimilarityOptions 及其現有的 WhitespaceMode 進行比較。檢查列出的三個 Git 空白設定如何對應到比較路徑；完成標準是 Compare 支援這些模式，且測試驗證每個設定。