Try to preserve column of comment start

[JimmyCushnie]

Suppose we have the following file:

key     : someValue                 # comment
key2    : shortValue                # another comment lmao

If we edit the value of key2 to be longer, the file will now look like this:

key     : someValue                 # comment
key2    : veryVeryLongValue                # another comment lmao

This is obviously not ideal. When the user creates pretty file formatting, SUCC should do its best to preserve that prettiness when the data changes.