ledmatrix: captures Qt::Key_R to rotate ledmatrix
pushbuttons: proper keyPress/keyRelease usage, added click focus policy since ledmatrix now captures
key events
RRAVRProcessor: round robin uses QApplication::processEvents to process incoming signals and removed
unnecessary uses of "this" keyword
misc: proper start/pause/stop semantics in mainwindow, added frequency and mmcu getters to
AVRProcessor for live frequency feedback