Rewrite electricity-logger to use an sqlite3 database

include/solar/server/configuration.hpp

@@ -0,0 +1,18 @@
+#pragma once
+#include <solar/server/database/database.hpp>
+#include <string>
+
+class Configuration {
+private:
+    Database::Database database;
+
+    Configuration();
+
+    friend int main(int, char **);
+    Configuration & SetupDatabase(std::string const & filePath);
+
+public:
+    Database::Connection GetDatabaseConnection() const;
+
+    static Configuration & Get();
+};