Refactoring of help and parse

Created by: tflori

Several improvements to the code are now possible. Also we improved some things already with this refactoring:

• Custom templates for usage and options through Help class
• Custom help formatter class through Getopt::setHelp()
• Pass Argument in Option constructor
• Argument mode MULTIPLE_ARGUMENT added
• Padding determined automatically (through default template)
• Line length determined automatically and description indented (through default template)
• Allowing ?!§$%# as short option names

This refactoring also brings some breaking changes:

• The second parameter for Getopt constructor is now an array of settings
• Getopt::setBanner() and Getopt::getBanner() are removed
• Options can't be overwritten instead you have to get the option instance and change it