Shapes for schematic.

ADDED arc, circle and rectangle shapes for schematic.  Shapes support
line styles and fill colors.

CHANGED sheet background color in Edit Text & Graphics Properties to
fill color (and it now affects shapes).

Pushed STROKE_PARAMS down into common and moved all shapes to using it
for stroke descriptions.

include/plotters/plotter.h

@@ -38,6 +38,7 @@
 #include <page_info.h>
 #include <outline_mode.h>
 #include <gal/color4d.h>
+#include <stroke_params.h>
 #include <render_settings.h>
 
 class COLOR_SETTINGS;
@@ -98,20 +99,6 @@ enum class PLOT_TEXT_MODE
     DEFAULT
 };
 
-/**
- * Dashed line types.
- */
-enum class PLOT_DASH_TYPE
-{
-    DEFAULT    = -1,
-    SOLID      = 0,
-    FIRST_TYPE = SOLID,
-    DASH,
-    DOT,
-    DASHDOT,
-    LAST_TYPE = DASHDOT
-};
-
 /**
  * Base plotter engine class. General rule: all the interface with the caller
  * is done in IU, the IU size is specified with SetViewport. Internal and