Examples: Updated for reorganized context functions. Calling CreateContext(), DestroyContext() in example code. Removed Shutdown() from binding code. (#1565, #586, #992, #1007, #1558)

examples/opengl3_example/main.cpp

@@ -32,6 +32,7 @@ int main(int, char**)
     gl3wInit();
 
     // Setup ImGui binding
+    ImGui::CreateContext();
     ImGui_ImplGlfwGL3_Init(window, true);
 
     // Setup style
@@ -109,6 +110,7 @@ int main(int, char**)
 
     // Cleanup
     ImGui_ImplGlfwGL3_Shutdown();
+    ImGui::DestroyContext();
     glfwTerminate();
 
     return 0;