BugFix: IntelliSenseのC++設定とビルドのC++設定の不整合をC++17に統一

Author: nokotan

.vscode/c_cpp_properties.json

@@ -11,7 +11,8 @@
             ],
             "defines": [
                 "_DEBUG",
-                "EMSCRIPTEN"
+                "EMSCRIPTEN",
+                "__EMSCRIPTEN__"
             ],
             "cStandard": "c11",
             "cppStandard": "c++17",

.vscode/tasks.json

@@ -15,7 +15,7 @@
                 "-o", "index.html",
 
                 // Compiler Flags
-                "-O1", "-std=c++11", "-g4",
+                "-O1", "-std=c++17", "-g4",
 
                 // Include & Library Directory
                 "-IDxLibForHTML5",  "-LDxLibForHTML5",
@@ -53,7 +53,7 @@
                 "-o", "Build/index.html",
 
                 // Compiler Flags
-                "-O3", "-std=c++11",
+                "-O3", "-std=c++17",
 
                 // Include & Library Directory
                 "-IDxLibForHTML5",  "-LDxLibForHTML5",