Refactoring

- Rename FileStorage to FileWriter
- Create FileReader
- Move reader logic from FileWriter to FileReader
Remove unsensed read body function from FileReader
Fix issue in saving data in FileWriter class
Add save function to FileWriter class

This function is an alias of write function
Fix issue closing file handler in FileWriter class
Check permissions in correct file in FileReader
Empty body for read function in FilReader
Disable perms checking in FileWriter due php check perms issue