#46 Extendig accelerator tables

[Uwe Kind]

Hello,

would it be possible to integrate the few lines of
code from the attached ExtendAcceleratorTable.txt into
the code base?

The function ExtendAcceleratorTable is usful for
assigning keyboard accelerators to controls without
overwriting the already existing mapping table of the
main window.

Thanks, Uwe

[Uwe Kind]

Changes to GUI.pm & GUI.xs to implement the ExtendAcceleratorTable function