Function getPayloadPath

tests/fl/codec/decode_file.hpp:63–69

static const char* DEFAULT_PAYLOAD_PATH = ".build/decode_payload.json";

static const char* getPayloadPath() {
    const char* env = ::getenv("FASTLED_DECODE_PAYLOAD");
    if (env && env[0]) {
        return env;
    }
    return DEFAULT_PAYLOAD_PATH;
}

static fl::string readFileToString(const char* path) {
    fl::FILE* f = fl::fopen(path, "rb");