Moved main plotting system implementation to own plugin. This makes
things more modular for the RAP application.
Removed GDA dependencies from ROIEditTable.
Created decorators for bounds. These are a non-GPL alterative to using
the rich beans widgets.
Created decorators for making Text widgts numbers with bounds.
Made setting a null ROI not allowed as breaks API.
Initial import of plugin.
Merge branch 'master' of git@github.com:DawnScience/dawn-ui.git

Conflicts:
	org.dawnsci.plotting.feature/feature.xml