TIniFile: Parse and manipulate INI configuration files

This class can be used to parse and manipulate configuration files in the INI format.

It can:

- Parse an INI file and store the configuration entries in a class variable
- Delete specific configuration entries or whole sections
- Get the definitions of a whole section as a string
- Get the section definitions keys and values as arrays
- Check whether a key exists
- Initialize or rename a section
- Add or change key values