Add PlatformIO project setup, local libraries, and PCB Gerber files

- Add platformio.ini for ESP32 DevKit (Arduino framework, espressif32 6.10.0)
- Vendor ArduinoJson, MPU6050_tockn, SCServo, Simple_FOC, and WebSockets
  so a fresh clone builds without downloading dependencies
- Add .gitignore rules for PlatformIO/IDE build artifacts
- Add controller PCB Gerber and drill files

3.Software/libraries/ArduinoJson/extras/tests/Cpp20/smoke_test.cpp

@@ -0,0 +1,15 @@
+#include <ArduinoJson.h>
+
+#include <catch.hpp>
+#include <string>
+
+TEST_CASE("C++20 smoke test") {
+  StaticJsonDocument<128> doc;
+
+  deserializeJson(doc, "{\"hello\":\"world\"}");
+  REQUIRE(doc["hello"] == "world");
+
+  std::string json;
+  serializeJson(doc, json);
+  REQUIRE(json == "{\"hello\":\"world\"}");
+}