Created the new class RoundedRectItem to create round rectangles items
on scene with custom rounded corners.
Created the new class RoundedRectItem to create round rectangles items
on scene with custom rounded corners.
Merge branch 'graphical-objs-changes' of https://github.com/pgmodeler/pgmodeler into graphical-objs-changes

Conflicts:
	libobjrenderer/src/roundedrectitem.cpp
Changed the style of graphical resentation of schemas, views, tables.
Now they are draw with rounded borders.
Created a styled text box.

Minor changes on TextboxView.
Merge branch 'graphical-objs-changes' into incl-alter-schemas
Minor change on sample models and asset images