Cleaned up SceneCanvas methods a bit
Cleaned up SceneCanvas methods a bit

ghisvail/vispy,julienr/vispy,sbtlaarzc/vispy,sh4wn/vispy,drufat/vispy,RebeccaWPerry/vispy,michaelaye/vispy,jdreaver/vispy,inclement/vispy,jay3sh/vispy,kkuunnddaannkk/vispy,michaelaye/vispy,QuLogic/vispy,jay3sh/vispy,srinathv/vispy,julienr/vispy,Eric89GXL/vispy,QuLogic/vispy,dchilds7/Deysha-Star-Formation,kkuunnddaannkk/vispy,bollu/vispy,sbtlaarzc/vispy,drufat/vispy,michaelaye/vispy,julienr/vispy,bollu/vispy,jay3sh/vispy,QuLogic/vispy,ghisvail/vispy,Eric89GXL/vispy,hronoses/vispy,sh4wn/vispy,dchilds7/Deysha-Star-Formation,hronoses/vispy,jdreaver/vispy,RebeccaWPerry/vispy,sh4wn/vispy,srinathv/vispy,srinathv/vispy,hronoses/vispy,dchilds7/Deysha-Star-Formation,drufat/vispy,sbtlaarzc/vispy,inclement/vispy,RebeccaWPerry/vispy,inclement/vispy,bollu/vispy,kkuunnddaannkk/vispy,ghisvail/vispy,Eric89GXL/vispy,jdreaver/vispy