Fix lwo exporter

Change to lefthand coord system
Revert "Made the grid size customizable"

This reverts commit bed6daa0667a1ec87fc85246fc146898153a9102.
Adjust grid size automatically

Many users have asked for an option for customize the grid size. After
a initial approaching by adding a option to Preferences file, now
after Dan's suggestion it is made automatically.

NOTE: The grid size is now adjusted automatically
Fixed recovery of unsaved files

Fixed a issue related to the routine that recover an unsaved file
(autosaved) not be working as it should.

problem reported in this post: http://www.wings3d.com/forum/showthread.php?tid=377&pid=4709#pid4709
Fixed crash in saved views

Fixed a problem with saved views mangement that was crashing Wings3d
if the first item in the list was deleted and someone tries to save a
new view hitting the RMB over an empty place.

The problem was reported in this post: http://www.wings3d.com/forum/showthread.php?tid=736

NOTE: Fixed crash in saved views (Thanks to Stem)
Fixed normalization of vectore in move/scale/rotate

Fixed a bug with the routine to get vertex and point for
move/scale/rotate operations. When the vector was obtained from vertex
on two or three objects we could get undesired result during the these
operations.

NOTE: Fixed a bug with the routine to get vertex and point for
move/scale/rotate operations. (Thanks PuzzledPaul)
Fixed crash in Set Constrain->Percentage in Edge mode,

Was happening after have picked the axis for Set
Constrain->Percentage in Edge mode.

The problem was reported in this post: http://www.wings3d.com/forum/showthread.php?tid=718

NOTE: Fixed crash in Set Constrain->Percentage in Edge mode,
      Thanks Arg Arg.
Fixed flip command crash

NOTE: Fixed a crash caused by Flip command when the object has virtual mirror.
Thanks VladD for report it.
Basic wx fixes (event handling)

Added redraw callback Windows requires it to get redrawing to work.

Event handling optimizations.

Fix keyboard events

hidden cursor, maxmize, get_mouse_state

get_mouse_state which returned the coordinates in screen coordinates.
Use wx file selector on all OS'es, and use wx image loader

Faster loading and builtin support of png, jpegs, gifs, tga and tiff.
Add real native window menus
Convert dialogs from OpenGL to wx
Create wx popup menues
Fix native statusbar and fix progressbar
Update menues in runtime, edit:repeat and file:recent_files
Remove geom menubar: Remember to fix Saved views
Fix dialog usage for object plugins
Fix textctrl (and history) in dialogs
Fix dialog conversion
Dialog fixes, added hook implementation

All hooks need to be reimplemented.

And minimize timing glitch, in preview dialogs