reorganized code into separate files

sensingModels/@fixedCardinalSensor/initialize.m

@@ -0,0 +1,10 @@
+function obj = initialize(obj, r)
+    arguments(Input)
+        obj (1, 1) {mustBeA(obj, 'fixedCardinalSensor')};
+        r (1, 1) double;
+    end
+    arguments(Output)
+        obj (1, 1) {mustBeA(obj, 'fixedCardinalSensor')};
+    end
+    obj.r = r;
+end