CUtils: Manipulate text and other general purpose function

This class can be used to manipulate text and other general purpose functions.

It can perform several types of operations to manipulate text strings and other functionality. Currently it can:

- Crop a text string up to a given limit number of characters
- Clean or replace certain types of characters from a string
- Convert text string between two character sets
- Detect string character set encoding
- Add quotes to a string
- Get an unique text string
- Check if a list of values is an empty string or has only not set values
- Check if a string begins, ends or contains another string
- Check if a string contains a separator of a given list
- Enclose text within HTML tags
- Encode text to display as HTML
- Output text code for executing as JavaScript
- Output headers or HTML tags to redirect users to another page
- Format values as money amounts or floating point numbers
- Output headers to disable browser cache
- Parse an URL
- Create an anchor link
- Validate e-mail addresses
- Send an e-mail message
- List files and directories within a directory
- Format dates
- Convert month numbers to month names
- Parse dates
- Compute the difference between two dates