fix [#24499] Consistency Issue with LassoSelect/ExtendOption

Added extend option to lasso. 

also...
- selecting bones wasn't checking their layer of if they were hidden in a number of places.
- fixed memory leak.

small unrealed changes
- added PBONE_VISIBLE macro
- renamed functions used for paint selectoin from *_tface to paintface_*. sine they no longer have anything todo with tface's.
- removed scanfill include from BLI_blenlib.h, this is only used in very few places and quite specific.


Noticed lasso select is broken for metaballs and face mask mode but this has been the case for a while, will look into it next.

source/blender/editors/mesh/editmesh_tools.c

@@ -57,6 +57,7 @@ editmesh_tool.c: UI called tools for editmesh, geometry changes here, otherwise
 #include "BLI_ghash.h"
 #include "BLI_linklist.h"
 #include "BLI_heap.h"
+#include "BLI_scanfill.h"
 
 #include "BKE_context.h"
 #include "BKE_depsgraph.h"