Updated to V0.2.4

1. Removed Utility-Handovers from ButtonHandler-Default-Constructor to
provide easy usage in Applications as well as prevent Bugs caused by
User-modified default font type in Graphics objects or similiar
problems.

2. Removed ArraySize-Handover (maximum Button Number) in
ButtonHandler-Default-Constructor so User does not have to decide on
how many Buttons may be created.

3. Added Second Constructor to ButtonHandler "public ButtonHandler (int
as)", so User may still provide the arraySize (= maximum Button Number)
if wanted.

(See Changelog)