Add corner chamfers to orx-shapes

orx-shapes/src/test/kotlin/Assertions.kt

@@ -0,0 +1,7 @@
+import org.amshove.kluent.shouldBeInRange
+import org.openrndr.math.Vector2
+
+infix fun Vector2.`should be near`(other: Vector2) {
+    x shouldBeInRange (other.x - 0.00001..other.x + 0.00001)
+    y shouldBeInRange (other.y - 0.00001..other.y + 0.00001)
+}