Search/Replace text within a `PlainText` source file

[tkvangorder]

Add a search/replace recipe that can be used on generic text source files. This will be an easy task when files are parsed as PlainText, this may become more complicated if the search and replace should span to other source file types.

It can be potentially dangerous to do generic text search/replace without semantic awareness when doing these types of operations on Java, XML, YAML, etc.