Overlay: Font - several atlas packing fixes
Overlay: Font - several atlas packing fixes

- glyphs could wrap around row edge
- glyphs would leak outside of their rect
OGRECave/ogre,paroj/ogre,paroj/ogre,paroj/ogre,OGRECave/ogre,OGRECave/ogre,OGRECave/ogre,paroj/ogre,OGRECave/ogre,paroj/ogre