..I'm working from Geany, so I needed a little tool to create classes with all this boring text that I need to write every time.

And here it is. It is as simple, as it could be:
$ createClass <classname>
..and it creates cpp & hpp files in current directory.

The script may receive up to three parameters:
[-s] [<dir>] <classname> | --help
Where:

• -s -- create a singleton class
• <dir> -- directory to put sources and headers into
• <classname> -- the name of the class to be created
• --help -- prints a help message with similair content