renderers: rename stereo 3d mode flag to more distinct name
added: support SBS and TAB display of xbmc gui
dvdplayer: pass stereo_mode to renderers and select what to render
d3d: support anaglyph stereo rendering
gl: support anaglyph and interlaced stereo rendering
add "3dmode" action to cycle between 3d modes
sys: add stereo rendering option for hardware based support
gl: support stereo rendering using opengl builtin system
dvdplayer: read stereo mode from filename same as omxplayer