make sure terminal uses codepage utf-8

Author: Jason2866

src/terminal.js

@@ -19,10 +19,15 @@ export default class PIOTerminal {
       envClone.PATH = process.env.PLATFORMIO_PATH;
       envClone.Path = process.env.PLATFORMIO_PATH;
     }
-    return vscode.window.createTerminal({
+    const terminal = vscode.window.createTerminal({
       name: 'pioarduino CLI',
       env: envClone,
     });
+    // Set Codepage to UTF-8, if Windows is used
+    if (process.platform === "win32") {
+      terminal.sendText('chcp 65001');
+    }
+    return terminal;
   }
 
   sendText(text) {