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/MemoryPool/clear.cpp

@@ -0,0 +1,32 @@
+// ArduinoJson - https://arduinojson.org
+// Copyright © 2014-2023, Benoit BLANCHON
+// MIT License
+
+#include <ArduinoJson/Memory/MemoryPool.hpp>
+#include <ArduinoJson/Strings/StringAdapters.hpp>
+#include <catch.hpp>
+
+using namespace ArduinoJson::detail;
+
+static const size_t poolCapacity = 512;
+
+TEST_CASE("MemoryPool::clear()") {
+  char buffer[poolCapacity];
+  MemoryPool pool(buffer, sizeof(buffer));
+
+  SECTION("Discards allocated variants") {
+    pool.allocVariant();
+
+    pool.clear();
+    REQUIRE(pool.size() == 0);
+  }
+
+  SECTION("Discards allocated strings") {
+    pool.saveString(adaptString(const_cast<char*>("123456789")));
+    REQUIRE(pool.size() == 10);
+
+    pool.clear();
+
+    REQUIRE(pool.size() == 0);
+  }
+}