Update Urho3DConfig.h

Convert tabs to spaces to conform with coding standards.
Update a couple macros to be the way they were intended.

Source/Urho3D/Urho3DConfig.h

@@ -23,9 +23,9 @@
 #pragma once
 
 #ifdef URHO3D_IS_BUILDING
-	#include "Urho3D.h"
+    #include "Urho3D.h"
 #else
-	#include <Urho3D/Urho3D.h>
+    #include <Urho3D/Urho3D.h>
 #endif
 
 // Macros with identifiers of c++ version.
@@ -36,16 +36,16 @@
 
 // Macro that can be used to identify c++ version.
 #ifndef URHO_CPLUSPLUS
-	#if defined(_MSVC_LANG) && !defined(__clang__)
-		// Note: VC14.0/1900 (VS2015) lacks too much from C++14
-		#if (_MSC_VER == 1900)
-			#define URHO_CPLUSPLUS URHO_CPP11_STANDARD
-		#else
-			#define URHO_CPLUSPLUS _MSVC_LANG
-		#endif
-	#else
-		#define URHO_CPLUSPLUS __cplusplus
-	#endif
+    #if defined(_MSVC_LANG) && !defined(__clang__)
+        // Note: VC14.0/1900 (VS2015) lacks too much from C++14
+        #if (_MSC_VER == 1900)
+            #define URHO_CPLUSPLUS URHO_CPP11_STANDARD
+        #else
+            #define URHO_CPLUSPLUS _MSVC_LANG
+        #endif
+    #else
+        #define URHO_CPLUSPLUS __cplusplus
+    #endif
 #endif
 
 // Macros with a strong guarantee of what c++ version is available.
@@ -54,35 +54,35 @@
 #define URHO_CPP17_OR_LATER (URHO_CPLUSPLUS >= URHO_CPP17_STANDARD)
 
 // Macros for specific c++ versions
-#if (URHO_CPLUSPLUS >= URHO_CPP11_STANDARD)
-	// Least match
-	#define URHO_CPP11(x) x
-	#define URHO_CPP14(x)
-	#define URHO_CPP17(x)
-	// Exact match
-	#define URHO_CPP11_ONLY(x) x
-	#define URHO_CPP14_ONLY(x)
-	#define URHO_CPP17_ONLY(x)
-#elif (URHO_CPLUSPLUS >= URHO_CPP14_STANDARD)
-	// Least match
-	#define URHO_CPP11(x) x
-	#define URHO_CPP14(x) x
-	#define URHO_CPP17(x)
-	// Exact match
-	#define URHO_CPP11_ONLY(x)
-	#define URHO_CPP14_ONLY(x) x
-	#define URHO_CPP17_ONLY(x)
-#elif (URHO_CPLUSPLUS >= URHO_CPP17_STANDARD)
-	// Least match
-	#define URHO_CPP11(x) x
-	#define URHO_CPP14(x) x
-	#define URHO_CPP17(x) x
-	// Exact match
-	#define URHO_CPP11_ONLY(x)
-	#define URHO_CPP14_ONLY(x)
-	#define URHO_CPP17_ONLY(x) x
+#if URHO_CPP11_OR_LATER
+    // Least match
+    #define URHO_CPP11(x) x
+    #define URHO_CPP14(x)
+    #define URHO_CPP17(x)
+    // Exact match
+    #define URHO_CPP11_ONLY(x) x
+    #define URHO_CPP14_ONLY(x)
+    #define URHO_CPP17_ONLY(x)
+#elif URHO_CPP14_OR_LATER
+    // Least match
+    #define URHO_CPP11(x) x
+    #define URHO_CPP14(x) x
+    #define URHO_CPP17(x)
+    // Exact match
+    #define URHO_CPP11_ONLY(x)
+    #define URHO_CPP14_ONLY(x) x
+    #define URHO_CPP17_ONLY(x)
+#elif URHO_CPP17_OR_LATER
+    // Least match
+    #define URHO_CPP11(x) x
+    #define URHO_CPP14(x) x
+    #define URHO_CPP17(x) x
+    // Exact match
+    #define URHO_CPP11_ONLY(x)
+    #define URHO_CPP14_ONLY(x)
+    #define URHO_CPP17_ONLY(x) x
 #else
-	#error Compiler does not support required c++ standard. How did you get here?
+    #error Compiler does not support required c++ standard. How did you get here?
 #endif
 
 // Case insensitive string comparison.