Merge pull request #28 from Monroe88/master

Add some cgps, fix 5xbr-retro.cg for Nvidia
(motionblur-simple.cg) from 4ch - should fix nvidia GPU issues
(motionblur-simple.cg) Last line should be coords.tex, not coords.prev
Add motionblur shader from https://gist.github.com/eadmaster/4108112
Add motionblur to a couple of presets
Modify lcd-cgwg.cgp to point to /motionblur/motionblur-simple.cg and delete the extra copy in handheld/lcd_cgwg/
(lcd-grid.cg) Add parameter for grid strength