reorganized code into separate files

@miSim/setupVideoWriter.m

@@ -0,0 +1,17 @@
+function v = setupVideoWriter(obj)
+    arguments (Input)
+        obj (1, 1) {mustBeA(obj, 'miSim')};
+    end
+    arguments (Output)
+        v (1, 1) {mustBeA(v, 'VideoWriter')};
+    end
+
+    if ispc || ismac
+        v = VideoWriter(fullfile('sandbox', strcat(string(datetime('now'), 'yyyy_MM_dd_HH_mm_ss'), '_miSimHist')), 'MPEG-4');
+    elseif isunix
+        v = VideoWriter(fullfile('sandbox', strcat(string(datetime('now'), 'yyyy_MM_dd_HH_mm_ss'), '_miSimHist')), 'Motion JPEG AVI');
+    end
+    
+    v.FrameRate = 1 / obj.timestep;
+    v.Quality = 90;
+end