Cleanup: use "num" as a suffix in: source/blender/blenlib

Also replace "num" with:
- "number" when it's not used to denote the number of items.
- "digits" when digits in a string are being manipulated.

source/blender/blenlib/BLI_scanfill.h

@@ -51,7 +51,7 @@ typedef struct ScanFillVert {
   unsigned int keyindex;
   unsigned short poly_nr;
   /** number of edges using this vertex */
-  unsigned char edge_tot;
+  unsigned char edge_count;
   /** vert status */
   unsigned int f : 4;
   /** flag callers can use as they like */