Merge two GitIgnore structs about go-gitignore HOT 3 OPEN

Hmm, I wrote this a whiles back. If anything I would want to make the constructor more idiomatic - ala gitignore.New(...) and then be able to Add(...) lines.

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That would be a better solution 👍

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Hmm, this would require re-implementing the line logic implemented in #15.
Like, adding a Source: string field to IgnorePattern maybe?
If we look at git check-ignore -v command's output e.g.

$ cat .gitignore
*.exe
*.test
*.prof

$ cat sample\.gitignore
*.test

$ mkdir -p sample sample/deep

$ touch upper.test sample/sample.test sample/deep/deeper.test

$ git check-ignore -v sample\sample.test upper.test sample\deep\deeper.test
sample/.gitignore:1:*.test      "sample\\sample.test"
.gitignore:26:*.test    upper.test
sample/.gitignore:1:*.test      "sample\\deep\\deeper.test"

• Looks like git is prioritizing the nearest parent gitignore file (my speculation from above *.test pattern's output).
• Here Sources will be .gitginore and sample/.gitignore.
• CompileIgnoreFile can set Source as the fpath.
• Not sure about CompileIgnoreLines (empty string or ignore if not passed?).

Also, I'm on windows, so not sure how git check-ignore outputs things on Linux (\\ or /)

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