Implement all replaceFsContent

In pollen I have created a new host method replaceWebContent which take a path, an old content and a new content to replace.

Need to be implemented in all forms:

• [x] replaceContent
• [x] replaceContentAS
• [x] replaceWebContent
• [x] replaceWebContentAS
• [x] replaceCache
• [x] replaceCacheAS