pothos-widgets: begin build environment for widgets
pothos-widgets: began slider stubs
pothos-library: fix signal emitter perfect forwarding
pothos-widgets: slider callbacks + docs
Merge branch 'fix_register_call' into widget_support
pothos-widgets: use call registry fix on slider
Merge branch 'master' into widget_support
pothos-widgets: added slider orientation
Merge branch 'master' into widget_support
pothos-widgets: rename widget query method
Merge branch 'master' into widget_support
pothos-gui: began work on graph object GraphDisplay
pothos-widgets: updated slider block desc to new synatax
Merge branch 'master' into widget_support
pothos-gui: messing with GraphDisplay render
Merge branch 'master' into widget_support

Conflicts:
	pothos-gui/GraphEditor/GraphEditor.cpp
pothos-gui: build fixes from last merge
pothos-gui: actually embedding qwidget -- so cool
Merge branch 'master' into widget_support

Conflicts:
	pothos-gui/GraphObjects/GraphBlockUpdate.cpp
Merge branch 'master' into widget_support