Overhaul sorting example
Overhaul sorting example

Add transparency to cubes.
Add colour to cubes.
Set a non-black background to demonstrate better.
Add overlay text to example.
Add ability to switch sorting from front_to_back
to back_to_front.

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