Move specialized plotter classes from plotter.h to specific plotter_xx.h

plotter.h contains now only a header common to all plotters.
The code does not actually change, but it allows modifying a specific plotter
without recompiling most of kicad files.

common/plotters/SVG_plotter.cpp

@@ -91,20 +91,20 @@
  * The center of ellipse is automatically calculated.
  */
 
+#include <config.h>
 #include <base64.h>
-#include <fctsys.h>
-#include <trigo.h>
 #include <eda_base_frame.h>
 #include <eda_rect.h>
 #include <base_struct.h>
 #include <common.h>
-#include <plotter.h>
-#include <macros.h>
 #include <kicad_string.h>
 
 #include <cstdint>
 #include <wx/mstream.h>
 
+#include "plotters_pslike.h"
+
+
 /**
  * Function XmlEsc
  * translates '<' to "&lt;", '>' to "&gt;" and so on, according to the spec: