new drawing.simba
remove TMufasaBitmap.rectangle
smart.simba no longer requires TDrawing, and added checks to see if the user has the openGL plugin.
Merge pull request #70 from Olly-/master

new drawing.simba & small smart.simba changes.
Fixed some doc errors + added options.simba to doc
Merge branch 'master' of https://github.com/SRL/SRL-6