CB-10263 Fix splashscreen plugin filenames for Asset Catalog

Github: close #69

src/ios/CDVSplashScreen.h

@@ -23,6 +23,7 @@
 typedef struct {
     BOOL iPhone;
     BOOL iPad;
+    BOOL iPhone4;
     BOOL iPhone5;
     BOOL iPhone6;
     BOOL iPhone6Plus;

src/ios/CDVSplashScreen.m

@@ -156,6 +156,7 @@ - (CDV_iOSDevice) getCurrentDevice
     device.iPad = (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPad);
     device.iPhone = (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPhone);
     device.retina = ([mainScreen scale] == 2.0);
+    device.iPhone4 = (device.iPhone && limit == 480.0);
     device.iPhone5 = (device.iPhone && limit == 568.0);
     // note these below is not a true device detect, for example if you are on an
     // iPhone 6/6+ but the app is scaled it will prob set iPhone5 as true, but
@@ -187,7 +188,23 @@ - (NSString*)getImageName:(UIInterfaceOrientation)currentOrientation delegate:(i
     {
         imageName = @"Default";
     }
-
+
+    // Add Asset Catalog specific prefixes
+    if ([imageName isEqualToString:@"LaunchImage"])
+    {
+        if (device.iPhone4 || device.iPhone5 || device.iPad) {
+            imageName = [imageName stringByAppendingString:@"-700"];
+        } else if(device.iPhone6) {
+            imageName = [imageName stringByAppendingString:@"-800"];
+        } else if(device.iPhone6Plus) {
+            imageName = [imageName stringByAppendingString:@"-800"];
+            if (currentOrientation == UIInterfaceOrientationPortrait || currentOrientation == UIInterfaceOrientationPortraitUpsideDown)
+            {
+                imageName = [imageName stringByAppendingString:@"-Portrait"];
+            }
+        }
+    }
+
     if (device.iPhone5)
     { // does not support landscape
         imageName = [imageName stringByAppendingString:@"-568h"];