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/JsonVariant/or.cpp

@@ -0,0 +1,159 @@
+// ArduinoJson - https://arduinojson.org
+// Copyright © 2014-2023, Benoit BLANCHON
+// MIT License
+
+#include <ArduinoJson.h>
+#include <catch.hpp>
+
+TEST_CASE("JsonVariant::operator|()") {
+  DynamicJsonDocument doc(4096);
+  JsonVariant variant = doc["value"].to<JsonVariant>();
+
+  SECTION("null") {
+    SECTION("null | const char*") {
+      std::string result = variant | "default";
+      REQUIRE(result == "default");
+    }
+
+    SECTION("null | int") {
+      int result = variant | 42;
+      REQUIRE(result == 42);
+    }
+
+    SECTION("null | bool") {
+      bool result = variant | true;
+      REQUIRE(result == true);
+    }
+
+    SECTION("null | ElementProxy") {
+      doc["array"][0] = 42;
+
+      JsonVariantConst result = variant | doc["array"][0];
+      REQUIRE(result == 42);
+    }
+
+    SECTION("null | MemberProxy") {
+      doc["other"] = 42;
+
+      JsonVariantConst result = variant | doc["other"];
+      REQUIRE(result == 42);
+    }
+
+    SECTION("ElementProxy | ElementProxy") {
+      doc["array"][0] = 42;
+
+      JsonVariantConst result = doc["array"][1] | doc["array"][0];
+      REQUIRE(result == 42);
+    }
+  }
+
+  SECTION("null") {
+    variant.set(static_cast<const char*>(0));
+
+    SECTION("null | const char*") {
+      std::string result = variant | "default";
+      REQUIRE(result == "default");
+    }
+
+    SECTION("null | int") {
+      int result = variant | 42;
+      REQUIRE(result == 42);
+    }
+
+    SECTION("null | bool") {
+      bool result = variant | true;
+      REQUIRE(result == true);
+    }
+
+    SECTION("null | ElementProxy") {
+      doc["array"][0] = 42;
+
+      JsonVariantConst result = variant | doc["array"][0];
+      REQUIRE(result == 42);
+    }
+
+    SECTION("null | MemberProxy") {
+      doc["other"] = 42;
+
+      JsonVariantConst result = variant | doc["other"];
+      REQUIRE(result == 42);
+    }
+  }
+
+  SECTION("int | const char*") {
+    variant.set(42);
+    std::string result = variant | "default";
+    REQUIRE(result == "default");
+  }
+
+  SECTION("int | uint8_t (out of range)") {
+    variant.set(666);
+    uint8_t result = variant | static_cast<uint8_t>(42);
+    REQUIRE(result == 42);
+  }
+
+  SECTION("int | ElementProxy") {
+    variant.set(42);
+    doc["array"][0] = 666;
+    JsonVariantConst result = variant | doc["array"][0];
+    REQUIRE(result == 42);
+  }
+
+  SECTION("int | MemberProxy") {
+    variant.set(42);
+    doc["other"] = 666;
+    JsonVariantConst result = variant | doc["other"];
+    REQUIRE(result == 42);
+  }
+
+  SECTION("int | int") {
+    variant.set(0);
+    int result = variant | 666;
+    REQUIRE(result == 0);
+  }
+
+  SECTION("double | int") {
+    // NOTE: changed the behavior to fix #981
+    variant.set(666.0);
+    int result = variant | 42;
+    REQUIRE(result == 42);
+  }
+
+  SECTION("bool | bool") {
+    variant.set(false);
+    bool result = variant | true;
+    REQUIRE(result == false);
+  }
+
+  SECTION("int | bool") {
+    variant.set(0);
+    bool result = variant | true;
+    REQUIRE(result == true);
+  }
+
+  SECTION("const char* | const char*") {
+    variant.set("not default");
+    std::string result = variant | "default";
+    REQUIRE(result == "not default");
+  }
+
+  SECTION("const char* | char*") {
+    char dflt[] = "default";
+    variant.set("not default");
+    std::string result = variant | dflt;
+    REQUIRE(result == "not default");
+  }
+
+  SECTION("int | char*") {
+    char dflt[] = "default";
+    variant.set(42);
+    std::string result = variant | dflt;
+    REQUIRE(result == "default");
+  }
+
+  SECTION("const char* | int") {
+    variant.set("not default");
+    int result = variant | 42;
+    REQUIRE(result == 42);
+  }
+}