Suggestion: Add `apply_to` method

I didn't feel like writing a test for `Suggestion.apply()`, which writes
files, so decided to write a different version that used the original
file and a writer.

Changed the `Suggestion.suggestion()` function to not prepend "+" to
suggestion lines so we can use the function to extract the suggested
lines unmodified from the comment. Kept the old version around as
`suggestion_patch()` because we may need it to generate patches.

Copied the code from `Suggestion.apply()`, except write the changes to
`writer` instead of the file at `Suggestion.path`.

0 files changed, 0 insertions, 0 deletions