[openrndr-demos] Add rectangle batch demos

openrndr-demos/src/demo/kotlin/DemoVolumeTexture01.kt

@@ -3,14 +3,8 @@ import org.openrndr.color.ColorRGBa
 import org.openrndr.draw.*
 import org.openrndr.extensions.Screenshots
 
-
 fun main() = application {
     program {
-
-        val screenshots = extend(Screenshots()) {
-
-        }
-
         val volumeTexture = VolumeTexture.create(128,128,32)
         val rt = renderTarget(128, 128) {
             volumeTexture(volumeTexture, 0)
@@ -18,9 +12,6 @@ fun main() = application {
 
         val cb = colorBuffer(128, 128)
         extend {
-
-            screenshots.afterScreenshot
-
             drawer.isolatedWithTarget(rt) {
                 drawer.ortho(rt)
                 drawer.clear(ColorRGBa.PINK)
@@ -28,6 +19,5 @@ fun main() = application {
             volumeTexture.copyTo(cb, 0)
             drawer.image(cb)
         }
-
     }
 }