Add compiler explorer extension for optimizing functions

.devcontainer/devcontainer.json

@@ -15,7 +15,9 @@
 		"vscode": {
 			"extensions": [
 				"ms-vscode.cpptools",
-				"ms-vscode.cmake-tools"
+				"ms-vscode.cmake-tools",
+				"rockcat.avr-support",
+				"harikrishnan94.cxx-compiler-explorer"
 			]
 		}
 	}

.vscode/settings.json

@@ -6,5 +6,9 @@
     "C_Cpp.files.exclude": {
         "build/**": true
     },
+    "files.associations": {
+        "*.S": "avr"
+    },
     "cmake.configureOnOpen": true,
+    "compilerexplorer.compilationDirectory": "${workspaceFolder}/build",
 }