Sort namespace insertion by length if grouping is not used

[fuelingtheweb]

If a common namespace prefix is not found and the user does not want to insert new lines for additional groupings (Config setting: Insert newlines for use statements), then the use statement will be inserted based on character length to ensure the use statements are sorted properly instead of having a shorter use statement fall to the bottom.

[poncianodiego]

@Peekmo why not merge? :(