Tweaks any enums that use uint_max values so that they have hard types to avoid any compiler kerfluffles with C++11 value narrowing, specifically pertaining to clang.

Engine/source/scene/simPath.h

@@ -49,7 +49,8 @@ class Path : public SimGroup
    typedef SimGroup Parent;
 
   public:
-   enum {
+   enum : U32
+   {
       NoPathIndex = 0xFFFFFFFF
    };