Added CoreLib class and brushlib folder
Brush Library: assigned abb extension for brush preset files
QZip class moved to the root cpp folder
Brush Library: brush presets loads from the brush pack file
Cursor changed when hovers the canvas area
Setted cursor shape for a pan mode
Fixed broken undo for deleting of layers
Added function for filling a layer some color
Wintab disabled on a Linux system
Added undo for Fill Color command
Colorpicker changes position the hsv selectors on getting new color
Ctrl+click picks color from canvas
Added saving and loading the settings
Fixed updating color picker value on startup from saved settings
Alpha for conversion hsvToHsl setted to 1
Fixed brocken loading the ora files
Added the dock window
Added the about window
Added shadow to the dock window
Renamed description for a pan hotkey