Added underwater-drawables

Added photo mode and Dev-Options are now in a dialog on the start screen
Both will only be shown if IS_DEVELOPER in the GameActivity is true

build.gradle

@@ -13,7 +13,7 @@ buildscript {
         google()
     }
     dependencies {
-        classpath 'com.android.tools.build:gradle:3.1.3'
+        classpath 'com.android.tools.build:gradle:3.1.4'
 
         // NOTE: Do not place your application dependencies here; they belong
         // in the individual module build.gradle files