[orx-shapes] Add irregular grid support and demo examples

This commit introduces `Rectangle.irregularGrid`, enabling the creation of grids with irregular spacing based on weights. New helper methods and properties for 2D rectangle lists, such as subgrid selection, bounds calculation, and random access, are also added. Additionally, two new demos showcase regular and irregular grid features.

orx-shapes/src/jvmDemo/kotlin/text/DemoText01.kt

@@ -5,8 +5,10 @@ import org.openrndr.color.ColorRGBa
 import org.openrndr.draw.font.loadFace
 import org.openrndr.extra.shapes.bounds.bounds
 import org.openrndr.extra.shapes.text.shapesFromText
+import org.openrndr.internal.Driver
 
 fun main() = application {
+    System.setProperty("org.openrndr.draw.wait_for_finish", "true")
     configure {
         width = 720
         height = 720