Implement parameters subsystem

* Unified parameters storage.
* Store parameters in flash on the hardware.
* Store parameters in text file in simulation.
* Work with parameters in command line.
* Support parameters in MAVLink for working with parameters in QGC.

gazebo/util.h

@@ -0,0 +1,9 @@
+#include <filesystem>
+
+std::filesystem::path getPluginPath() {
+	Dl_info dl_info;
+	if (dladdr((void*)&getPluginPath, &dl_info) == 0) {
+		throw std::runtime_error("Unable to determine plugin path using dladdr.");
+	}
+	return std::filesystem::path(dl_info.dli_fname);
+}