patch draw(a::Actor) function

[dustyirwin]

Update draw(a::Actor) method to use SDL2.DestroyTexture on generated textures after they have been rendered. Should address #15

[aviks]

Thanks for this. For the record, what platform were you primarily testing this on?

[dustyirwin]

No problem :) I was using Ubuntu 20.04 Linux, but ran into sound card issues related to a missing alsa.conf file, so I switched to Windows 10 and it seems to be working OK.

I found this fix reading through this SDL post: https://stackoverflow.com/questions/30768985/sdl-image-disappears-after-15-seconds and destroying the textures seemed to fix my issue. However, as Benjamin Lindley points out, it would likely be better to pre-load textures that have a lot of demand to avoid having to re-create and destroy them.