Added mouse events into DrawText class
Litle refactoring. To fix: text moving
Fixed text moving. To add font config dialog
Added setBrush feature & for text font config set get functions
Prepare code for FontDialog class
Renamed Text classes. Added config font & color in the text. TODO: save previous text config choice
Added ItemGroup
Added class Rubber. Added close tab feature
Added title text in dockwidget & limited it places only at right and left
Fixed bug with memory leak for drawing primitives, but leak is present for text drawing
Fixed bug with memory leak
Fixed coordinats displaying. Changed x2 & y2 to dx & dy
Changed start x & y cjjrdinates displaying to end coordinates
Added class CanvasObserver. To fix: text drawing
Fixed text drawing
Fixed clear background image bug
Added features: close tab action & toogling drawing buttons