Killed silly modal PoseMode mode! :)

- PoseMode now is a state Armature Objects can be in. So, while in PoseMode
  for an Armature, you can just select another Object or Armature.
- The old PoseMode options (transform, insert keys etc) are accessible
  with making the Armature Object 'active' (and have object in PoseMode).
- At this moment no multiple Poses can be transformed/edited at the same
  time.
- The old hotkey CTRL+TAB, and view3d header menu, still work to set an
  Object's PoseMode

It was quite a lot recode, so tests & reports are welcome.

Oh, as a bonus I added Lasso Select for Bones in PoseMode! It selects using
only the line between root and tip of the Bone.

source/blender/src/renderwin.c

@@ -66,6 +66,7 @@
 #include "DNA_vec_types.h"
 
 #include "BKE_global.h"
+#include "BKE_scene.h"
 #include "BKE_utildefines.h"
 
 #include "BIF_gl.h"