Refactor the config objects into singleton-like objects

[curieos]

Currently the module config object and plant config object are not instanced anywhere, as only their static methods and members are accessed.

Firmware/include/config.h

Lines 52 to 75 in 881d03b

	class ModuleConfig {
	public:
	static void ReadConfigFromFile();
	static void WriteConfigToFile();
	static void AddNetwork(const char *ssid, const char *password);
	static std::vector<Network> GetNetworks() { return networks; }
	static const char *GetName() { return name; }
	static int32_t GetTimezoneOffset() { return timezone_offset; }
	static void SetupModule(const char *raw_config);
	private:
	static char name[100];
	static int32_t timezone_offset;
	static std::vector<Network> networks;
	};
	class PlantConfig {
	public:
	static const char *GetName() { return name; }
	static void SetupPlant(const char *raw_config);
	private:
	static char name[100];
	};

This should be changed so each object that requires them has them injected in their constructor, and a single instance of each is created in the root file, or with the dependency injection framework used in #3.