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/TextFormatter/writeInteger.cpp

@@ -0,0 +1,55 @@
+// ArduinoJson - https://arduinojson.org
+// Copyright © 2014-2023, Benoit BLANCHON
+// MIT License
+
+#include <catch.hpp>
+#include <limits>
+#include <string>
+
+#include <ArduinoJson/Json/TextFormatter.hpp>
+#include <ArduinoJson/Serialization/Writer.hpp>
+
+using namespace ArduinoJson::detail;
+
+template <typename T>
+void checkWriteInteger(T value, std::string expected) {
+  char output[64] = {0};
+  StaticStringWriter sb(output, sizeof(output));
+  TextFormatter<StaticStringWriter> writer(sb);
+  writer.writeInteger<T>(value);
+  REQUIRE(expected == output);
+  REQUIRE(writer.bytesWritten() == expected.size());
+}
+
+TEST_CASE("int8_t") {
+  checkWriteInteger<int8_t>(0, "0");
+  checkWriteInteger<int8_t>(-128, "-128");
+  checkWriteInteger<int8_t>(127, "127");
+}
+
+TEST_CASE("uint8_t") {
+  checkWriteInteger<uint8_t>(0, "0");
+  checkWriteInteger<uint8_t>(255, "255");
+}
+
+TEST_CASE("int16_t") {
+  checkWriteInteger<int16_t>(0, "0");
+  checkWriteInteger<int16_t>(-32768, "-32768");
+  checkWriteInteger<int16_t>(32767, "32767");
+}
+
+TEST_CASE("uint16_t") {
+  checkWriteInteger<uint16_t>(0, "0");
+  checkWriteInteger<uint16_t>(65535, "65535");
+}
+
+TEST_CASE("int32_t") {
+  checkWriteInteger<int32_t>(0, "0");
+  checkWriteInteger<int32_t>(-2147483647 - 1, "-2147483648");
+  checkWriteInteger<int32_t>(2147483647, "2147483647");
+}
+
+TEST_CASE("uint32_t") {
+  checkWriteInteger<uint32_t>(0, "0");
+  checkWriteInteger<uint32_t>(4294967295U, "4294967295");
+}