Fix 'No change of association symbol line colour and width possible'.
The bug is caused by two issues: 1. line color changes are not routed through the virtual method setLineColor() 2. class AssociationLine did not propagate line color changes to the related symbols. This patch includes a minor refactoring in class AssociationLine to provide the standard pen based api, which is required to set symbol pen. BUG:358358 CCBUG:358365 FIXED-IN:2.18.2 (KDE Applications 15.12.2)
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