Preserving case when replacing

[darkdragon-001]

Summary

When using case-insensitive search, it would be nice to allow a replace operation which preserves case (add an option for that).

Motivation

Your project name is often spelled in CamelCase while the package name etc. should be in small letters (e.g. camelcase).

Describe alternatives you've considered

Do consecutive operations with all different possible spellings. When using Find in files will be a lot of work...

Moved from atom/atom#20625