color support prototype
Merge branch 'master' into colors
Merge branch 'master' into colors
box shadow is set to have the color of the border line color

selection shadow is an outer shadow instead of an inner one
empty registry values for colors (default)
support passing default colors in constructor argument
passing default background color in constructor argument
MetaDecorator supports colors
Merge branch 'master' into colors
Merge branch 'master' into colors
delete unused values
refactor constant values
create common place for REGISTRY_KEYS
Merge branch 'master' into colors
refactor MEtaEditorConstants.META_SHEET_REGISTRY_KEY  to RegistryKeys.META_SHEETS
line style registry fix

color is not handled so far, needs to be fixed
refactor decorator disabled connection areas registry key
bugfix: not to try to set connection related button enabled/disabled status since they are not there...
line width dropdown in DiagramDesignerWidget's toolbar
use constant's value insted of hardcoded value