dab canvas moved to main window
fixed lock layer on loading file
disabled status bar
fixed undo for clear brush
updated brush presets
fixed double drawing the layer after loading it from file
changed default settings
changing title for some undo command
image is unloaded from canvas after loading and painting
scrollview used for panning the canvas
fixed origin for scaling and rotating the canvas
transform resets on creating new tab and loading the file
canvas transform resets after adding new tab
max zoom limited by 3000%, min zoom limited by 1%