pothos-library: add args support for block param widget option
pothos-gui: support new param widget options
pothos-blocks: use widget options where applicable
pothos-library: doc parse supports escapes for brackets in some markup
pothos-blocks: used escaped brackets, and editable combo box
pothos-gui: support editable combo box
Merge branch 'widget_options'
Merge branch 'master' into widget_support
pothos-gui: began work on graph object GraphDisplay
pothos-widgets: updated slider block desc to new synatax