Fix: Fixed several glitches for the window layout management and window resizing

Fix: With some pen/tablets an internal error occurred when using WinTab interface. This error is now caught so that the program can still be used. A message appears that pressure support is disabled.

Fix: Invalid file type preselected in single image export file dialog after previous usage.

Fix: Unwanted log file writing disabled.

Fix: Transformation options where not allowed for separate tools like scale, skew, rotate.

Fix: Internal error at start up.

Fix: Airbrush now supports transparency lock. Actually the AirBrush does not use a paint mode and the transparency lock is a paint mode setting. But since it's a painting tool it makes sense to also use the lock options with it.

Fix: Scrolling through blend modes in layer window rewinded when hitting a separator.

Fix: Animation playback got stuck if frame has a delay of 0ms.

Fix: Error when closing drop shadow effect dialog while trackbar of opacity input was visible.

Added some explaining message dialog to Window arrange and default layout functions

Project tab can now be closed with middle mouse button.

Improved key handling when stamping brush over frames.
When stamping a brush over frames is enabled for paint dotted/continuous tool by holding Ctrl + Alt then the cursor changes so that it can bee seen that this function is active.
Even if stamping a brush over frames (option "Stamp AnimBrush") is enabled then the temporary tool assigned to Ctrl key can now be used (which is the pipette tool by default). The stamp mode starts when also Alt is hold.

Added another interface to access pen pressure data for non Wacom tablets.

Fixing invalid positionion of tile palette window in default window layout.

Added audio track to animation playback. Play a WAV file along with your animation.

Added visual checkbox for handle toggle in transformation tool options.

Brush shade up/down now working on current gradient for single color brushes.

Added shortcut to append the active brush to the current project as frame(s).

Added option to hide grid in canvas window.