Fichero: Create and manipulate files

This is a simple class that can be used to create and manipulate files.

It can open files for reading or for writing data.

The class can also read the contents of a file into a string, into a single string separating lines with spaces after removing white spaces from the beginning and end of each line, or into an array with one file line per entry.

The class may also search for content in a file using regular expressions.

The code and the comments are in Spanish.