Started the modifications to generate seppareted ALTER definitions due
to diff feature.
Minor fix on domain class and editing form that was not resetting the
constraint name attribute.
Minor adjustment on modeldatabasediffform.ui
Minor improve when moving a schema object. Relationship points will be
moved together.
Minor fix on schema editing form.

SQL disabled status are now displayed as a textbox on top of tables and
schemas. Other objects will continue to have their names striked out to
denote the deactivation of SQL code.
Improvements on the generation of SQL disabled info item.
Added a sql disabled info item for relationships.
Minor adjustments on textbox resizing.

Minor adjustments on relationships custom points descriptors in order to
give better selection and movement.
Change the relationship cardinality pattern from (1,n) to 1:n
Change the relationship cardinality pattern from (1,n) to 1:n

Minor label adjustment for many-to-many relatinships
Merge branch 'incl-alter-schemas' of https://github.com/pgmodeler/pgmodeler into incl-alter-schemas
Minor fix on the generation of sql disabled info item.
Fixed the click on the object select input field. When the control is
disabled the object selection dialog will not be opened.
Minor improvements on how sql disabled info item is generated and
managed.

Fixed a bug on when exporting model to png that was exporting
unnecessary blank areas.
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