Add option to insert snippet after cursor

[cheerio-pixel]

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[benfowler]

Hi! Thanks for the pull request.

Just to add a bit of context: what was the problem you were trying to solve here? I personally haven't had to insert snippets after the cursor and was curious about your use case.

[cheerio-pixel]

Sorry for not explaining, I come from tempel.el and there i relearned snippets to be mini templates that i search by name and compose, and this leads to write a snippet like lazy: () =>, for csharp where this is going to be in the middle of a expression, the previous behaviour makes no sense, also if you write common things like .Trace(msg), Console.WriteLine, console.log private readonly, and so on, they will be inserted in the previous char to the last character, which at best is inconvenient and at worse annoying. So TLDR, this behaviour makes much more sense to me