Various fixes to pin drawing code

- Better shape to the 60617 pin markers
- Made the markers' size proportional to the pin text
- Added the missing implementation in the pin plot routines

eeschema/lib_pin.h

@@ -34,12 +34,6 @@
 
 #define TARGET_PIN_RADIUS   12  // Circle diameter drawn at the active end of pins
 
-// pins: special symbols sizes
-#define INVERT_PIN_RADIUS   30  // Radius of inverted pin circle.
-#define CLOCK_PIN_DIM       40  // Dim of clock pin symbol.
-#define IEEE_SYMBOL_PIN_DIM 40  // Dim of special pin symbol.
-#define NONLOGIC_PIN_DIM    30  // Dim of nonlogic pin symbol (X).
-
 /**
  * The component library pin object electrical types used in ERC tests.
  */