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/JsonObject/isNull.cpp

@@ -0,0 +1,58 @@
+// ArduinoJson - https://arduinojson.org
+// Copyright © 2014-2023, Benoit BLANCHON
+// MIT License
+
+#include <ArduinoJson.h>
+#include <catch.hpp>
+
+TEST_CASE("JsonObject::isNull()") {
+  SECTION("returns true") {
+    JsonObject obj;
+    REQUIRE(obj.isNull() == true);
+  }
+
+  SECTION("returns false") {
+    DynamicJsonDocument doc(4096);
+    JsonObject obj = doc.to<JsonObject>();
+    REQUIRE(obj.isNull() == false);
+  }
+}
+
+TEST_CASE("JsonObjectConst::isNull()") {
+  SECTION("returns true") {
+    JsonObjectConst obj;
+    REQUIRE(obj.isNull() == true);
+  }
+
+  SECTION("returns false") {
+    DynamicJsonDocument doc(4096);
+    JsonObjectConst obj = doc.to<JsonObject>();
+    REQUIRE(obj.isNull() == false);
+  }
+}
+
+TEST_CASE("JsonObject::operator bool()") {
+  SECTION("returns false") {
+    JsonObject obj;
+    REQUIRE(static_cast<bool>(obj) == false);
+  }
+
+  SECTION("returns true") {
+    DynamicJsonDocument doc(4096);
+    JsonObject obj = doc.to<JsonObject>();
+    REQUIRE(static_cast<bool>(obj) == true);
+  }
+}
+
+TEST_CASE("JsonObjectConst::operator bool()") {
+  SECTION("returns false") {
+    JsonObjectConst obj;
+    REQUIRE(static_cast<bool>(obj) == false);
+  }
+
+  SECTION("returns true") {
+    DynamicJsonDocument doc(4096);
+    JsonObjectConst obj = doc.to<JsonObject>();
+    REQUIRE(static_cast<bool>(obj) == true);
+  }
+}