Added support for 'Schluß' (closing quotes)

Issue: #141
Updated Yahoo security search
Escape special characters in HTML quote feed URL
Release 0.12.2
Next development version 0.12.3-SNAPSHOT
Added generic attribute types to model
Added wizard page to edit additional attributes of securities
Added attribute columns to securities table
Added first editing support for movable columns
Added adaptor call to column viewer sorter
Used new column editing support for account list view
Used new column editing support for portfolio list view
Used new column editing support for investment plan view
Used new column editing support for consumer price index
Used new column editing support for security prices table
Used new column editing support for import dialog
Formatted and fixed minor details
ShowHideColumnHelper nows supports also TreeViewers
Use ShowHideColumnHelper for taxonomy tree views
Extracted Column from ShowHideColumnHelper