Updated Nuklear submodule

Author: TheMostDiligent

.gitmodules

@@ -1,3 +1,6 @@
 [submodule "ThirdParty/glfw"]
 	path = ThirdParty/glfw
 	url = https://github.com/DiligentGraphics/glfw.git
+[submodule "ThirdParty/Nuklear"]
+	path = ThirdParty/Nuklear
+	url = https://github.com/Immediate-Mode-UI/Nuklear

README.md

@@ -406,7 +406,7 @@ This sample demonstrates the integration of the engine with [dear imgui](https:/
 
 ![](Samples/NuklearDemo/Screenshot.png)
 
-This sample demonstrates the integration of the engine with [nuklear](https://github.com/vurtun/nuklear) UI library.
+This sample demonstrates the integration of the engine with [nuklear](https://github.com/Immediate-Mode-UI/Nuklear) UI library.
 
 
 ## [Hello AR](Android/HelloAR)
@@ -477,7 +477,7 @@ See [Apache 2.0 license](License.txt).
 
 This project has some third-party dependencies, each of which may have independent licensing:
 
-* [nuklear](https://github.com/vurtun/nuklear): A single-header ANSI C gui library ([MIT or Public domain license](https://github.com/DiligentGraphics/nuklear/blob/master/Readme.md)).
+* [nuklear](https://github.com/Immediate-Mode-UI/Nuklear): A single-header ANSI C gui library ([MIT or Public domain license](https://github.com/Immediate-Mode-UI/Nuklear/blob/master/LICENSE)).
 * [glfw](https://github.com/glfw/glfw): A multi-platform library for OpenGL, OpenGL ES, Vulkan, window and input ([zlib License](https://github.com/DiligentGraphics/glfw/blob/master/LICENSE.md)).
 * [ImGuizmo](https://github.com/CedricGuillemet/ImGuizmo): Immediate mode 3D gizmo for scene editing and other controls based on Dear Imgui ([MIT](https://github.com/CedricGuillemet/ImGuizmo/blob/master/LICENSE)).
 

ThirdParty/CMakeLists.txt

@@ -3,7 +3,7 @@ cmake_minimum_required (VERSION 3.10)
 file(RELATIVE_PATH SAMPLES_DIR "${CMAKE_SOURCE_DIR}" "${CMAKE_CURRENT_SOURCE_DIR}/..")
 
 if (NOT DILIGENT_NUKLEAR_DIR)
-    set(DILIGENT_NUKLEAR_DIR "${CMAKE_CURRENT_SOURCE_DIR}/nuklear" CACHE PATH "nuklear source directory")
+    set(DILIGENT_NUKLEAR_DIR "${CMAKE_CURRENT_SOURCE_DIR}/Nuklear" CACHE PATH "nuklear source directory")
 endif()
 if (NOT EXISTS "${DILIGENT_NUKLEAR_DIR}/nuklear.h")
     message(FATAL_ERROR "${DILIGENT_NUKLEAR_DIR}/nuklear.h does not exist. This indicates that nuklear submodule is not checked out or DILIGENT_NUKLEAR_DIR variable contains invalid path.")