Delegated SwingScoutColumn creation to the SwingEnvironment. Created a
getScoutColumnWidth method to be used by the SwingScoutColumn
constructor. Bugzilla 406059.
Merge remote-tracking branch 'origin/master'
Merge branch 'master' of https://github.com/awegmueller/scout.rt.git

Conflicts:
	org.eclipse.scout.rt.ui.swing/src/org/eclipse/scout/rt/ui/swing/ISwingEnvironment.java
	org.eclipse.scout.rt.ui.swing/src/org/eclipse/scout/rt/ui/swing/basic/table/SwingTableColumn.java