Added SOD-923 footprint (#1999)

* Added SOD-923 footprint
Datasheet: https://www.onsemi.com/pub/Collateral/ESD9B-D.PDF

* Fixed front courtyard and datasheet link.

* Coutyard should take pads into account, and silkscreen clearance at least line width.

* Fix courtyard in 0.01mm grid

Diode_SMD.pretty/D_SOD-923.kicad_mod

@@ -0,0 +1,46 @@
+(module D_SOD-923 (layer F.Cu) (tedit 5E05C456)
+  (descr https://www.onsemi.com/pub/Collateral/ESD9B-D.PDF#page=4)
+  (tags "Diode SOD923")
+  (attr smd)
+  (fp_text reference REF** (at 0 -1.2) (layer F.SilkS)
+    (effects (font (size 1 1) (thickness 0.15)))
+  )
+  (fp_text value D_SOD-923 (at 0 1.2) (layer F.Fab)
+    (effects (font (size 1 1) (thickness 0.15)))
+  )
+  (fp_line (start 0.5 0.4) (end -0.8 0.4) (layer F.SilkS) (width 0.12))
+  (fp_line (start 0.5 -0.4) (end -0.8 -0.4) (layer F.SilkS) (width 0.12))
+  (fp_line (start 0.4 0.3) (end -0.4 0.3) (layer F.Fab) (width 0.1))
+  (fp_line (start -0.4 0.3) (end -0.4 -0.3) (layer F.Fab) (width 0.1))
+  (fp_line (start -0.4 -0.3) (end 0.4 -0.3) (layer F.Fab) (width 0.1))
+  (fp_line (start 0.4 -0.3) (end 0.4 0.3) (layer F.Fab) (width 0.1))
+  (fp_line (start -0.15 0.2) (end -0.15 -0.2) (layer F.Fab) (width 0.1))
+  (fp_line (start -0.15 0) (end -0.25 0) (layer F.Fab) (width 0.1))
+  (fp_line (start -0.15 0) (end 0.15 0.2) (layer F.Fab) (width 0.1))
+  (fp_line (start 0.15 0.2) (end 0.15 -0.2) (layer F.Fab) (width 0.1))
+  (fp_line (start 0.15 -0.2) (end -0.15 0) (layer F.Fab) (width 0.1))
+  (fp_line (start 0.15 0) (end 0.25 0) (layer F.Fab) (width 0.1))
+  (fp_line (start 0.55 0.45) (end -0.55 0.45) (layer F.CrtYd) (width 0.05))
+  (fp_line (start -0.55 0.45) (end -0.55 0.28) (layer F.CrtYd) (width 0.05))
+  (fp_line (start -0.55 -0.45) (end 0.55 -0.45) (layer F.CrtYd) (width 0.05))
+  (fp_line (start 0.55 -0.45) (end 0.55 -0.28) (layer F.CrtYd) (width 0.05))
+  (fp_line (start -0.8 -0.4) (end -0.8 0.4) (layer F.SilkS) (width 0.12))
+  (fp_text user %R (at 0 -1.2) (layer F.Fab)
+    (effects (font (size 1 1) (thickness 0.15)))
+  )
+  (fp_line (start 0.55 -0.28) (end 0.75 -0.28) (layer F.CrtYd) (width 0.05))
+  (fp_line (start 0.75 -0.28) (end 0.75 0.28) (layer F.CrtYd) (width 0.05))
+  (fp_line (start 0.75 0.28) (end 0.55 0.28) (layer F.CrtYd) (width 0.05))
+  (fp_line (start 0.55 0.28) (end 0.55 0.45) (layer F.CrtYd) (width 0.05))
+  (fp_line (start -0.55 -0.28) (end -0.75 -0.28) (layer F.CrtYd) (width 0.05))
+  (fp_line (start -0.75 -0.28) (end -0.75 0.28) (layer F.CrtYd) (width 0.05))
+  (fp_line (start -0.75 0.28) (end -0.55 0.28) (layer F.CrtYd) (width 0.05))
+  (fp_line (start -0.55 -0.28) (end -0.55 -0.45) (layer F.CrtYd) (width 0.05))
+  (pad 1 smd rect (at -0.42 0 180) (size 0.36 0.25) (layers F.Cu F.Paste F.Mask))
+  (pad 2 smd rect (at 0.42 0 180) (size 0.36 0.25) (layers F.Cu F.Paste F.Mask))
+  (model ${KISYS3DMOD}/Diode_SMD.3dshapes/D_SOD-923.wrl
+    (at (xyz 0 0 0))
+    (scale (xyz 1 1 1))
+    (rotate (xyz 0 0 0))
+  )
+)