Edit Mesh: Fix some problem with new implementation

- Add manual depth offset to vertices and edges.
- Revert to plain edge decoration.
- Fix active edge coloring.
- Remove active face display if not in face selection mode.
- Add wide line support.

source/blender/draw/intern/DRW_render.h

@@ -289,7 +289,7 @@ typedef enum {
 	DRW_STATE_OFFSET_POSITIVE = (1 << 12),
 	/** Polygon offset. Does not work with lines and points. */
 	DRW_STATE_OFFSET_NEGATIVE = (1 << 13),
-	/* DRW_STATE_STIPPLE_4     = (1 << 14), */ /* Not used */
+	DRW_STATE_WIRE_WIDE     = (1 << 14),
 	DRW_STATE_BLEND         = (1 << 15),
 	DRW_STATE_ADDITIVE      = (1 << 16),
 	DRW_STATE_MULTIPLY      = (1 << 17),