Making PascalIO package compilable on platforms different to Linux
Fixed spelling: TGpioPin.AcitveLow renamed to TGpioPin.ActiveLow
New Package: PascalIO GUI

Contains GPIO components which can be installed in Lazarus and dropped onto a form for easy control interfaces.
TGpioPin.PollChange() overloaded
The new overloaded method TGpioPin.PollChange() can be cancelled after each poll via a callback. The method's result indicates the reason why the method returned (change, timout or cancel).