reorganized code into separate files

geometries/@rectangularPrism/random.m

@@ -0,0 +1,9 @@
+function r = random(obj)
+    arguments (Input)
+        obj (1, 1) {mustBeA(obj, 'rectangularPrism')};
+    end
+    arguments (Output)
+        r (1, 3) double
+    end
+    r = (obj.vertices(1, 1:3) + rand(1, 3) .* obj.vertices(8, 1:3) - obj.vertices(1, 1:3))';
+end