bugfix - running scriptlinks did not initialize the armature weakref dict, thanks for finding caedes!

this bug is in 2.45 but can work around by setting it manually
---
import sys as pysys
try:
	pysys.modules['__main__'].__arm_weakrefs
except:
	pysys.modules['__main__'].__arm_weakrefs = {}
---

changed how draw modes work - when displaying textured meshes in editmode, only draw selected edges when "Edge Draw" is not enabled. this makes it easy to see the texture/mapping without edges getting in the way.
This means editmode can draw like UV/Face mode did when "Draw Edges" was disabled.

Also made the active vert/edge/face color themeable, still need to set the default to somthing other then pink.

source/blender/python/BPY_interface.c

@@ -1915,7 +1915,12 @@ void BPY_do_pyscript( ID * id, short event )
 		/* invalid scriptlinks (new .blend was just loaded), return */
 		if( during_slink < 0 )
 			return;
-
+		
+		if( !setup_armature_weakrefs()){
+			printf("Oops - weakref dict\n");
+			return;
+		}
+		
 		/* tell we're running a scriptlink.  The sum also tells if this script
 		 * is running nested inside another.  Blender.Load needs this info to
 		 * avoid trouble with invalid slink pointers. */