Updating version to 1.5
Fix NullReferenceException when opening file without a solution opened.
Outlines: Persist data changes when clearing all regions in a document
Initial code for current column highlight
CurrentColumn: Fix redrawing, size and support virtual space
CurrentColumn: Add Separate option for current column highlighting
CurrentColumn: Add separate format definition, plus unify line widths for line/column highlight
Make current line/column highlight line width configurable
Merge branch 'columns' into develop
CurrentColumn: ensure it doesn't get painted over peek-definition window
Refactoring global settings store to make it pluggable
Make it possible to provide alternate paths for xml settings store
Adding new tests for GlobalXmlSettingsStore and fixing some issues
Merge branch 'refactor_settings' into develop