should ignore BOM in .gitignore

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Reproduction steps

1. Try this with an existing repo. Put a BOM at the header of a .gitignore file, and a directory to ignore such as .vs/ on the same (top, first) line of the .gitignore file.
2. confirm command-line native git still ignores the .vs directory.
3. Write a quick program that uses libgit2sharp to look at the above repo and get the status.
4. Get the status and note the status is marked dirty, and the .vs dir is listed as untracked, not ignored.

Expected behavior

The status reported by libgit2sharp should report status is clean. It should ignore the .vs dir.

Actual behavior

The .vs dir is listed as untracked, not ignored.

The status is dirty.

Version of LibGit2Sharp (release number or SHA1)

0.26.2

Operating system(s) tested; .NET runtime tested

Windows 10

在 Windows 10 上使用 LibGit2Sharp 0.26.2 重现该报告，使用的 .gitignore 第一行以 BOM 开头并指定 .vs。将其状态与原生 Git 进行比较。当 LibGit2Sharp 报告状态干净，并将 .vs 标记为已忽略而不是未跟踪时，即表示完成。