Action links should not have Strikethrough

When a transaction like a contribution is cancelled, it is displayed in red with strikethrough in the Contact Summary page contribution tab. However, the links to view, edit, and delete the transaction, which are still active and work, are displayed with strikethrough in their ordinary colour. As they work normally, the strikethrough should not be applied to them.

• Removed line-through directive for .disabled class (line-through degrades readabilty for the entire row)
• Added .cancelled class (so folks can differentiate cancelled from disabled at some point if they want to).
• Set color to #999999 for both .cancelled and .disabled