DB: remove shared stuff, add singleton

Add Config class

source/main.d

@@ -1,5 +1,45 @@
 module main;
 
-void main() {
+import slf4d;
+import slf4d.default_provider;
 
+import config;
+import singletons;
+import db.db;
+
+int main() {
+	auto provider = new DefaultProvider(true, Levels.DEBUG);
+	configureLoggingProvider(provider);
+
+	Config cfg = new Config();
+
+	try {
+		cfg.load();
+	} catch (Exception e) {
+		error(e);
+		return 21;
+	}
+
+	DBSettings dbSettings;
+	auto dbCfg = cfg.v["db"];
+	with (dbSettings) {
+		host = dbCfg["host"].str;
+		port = cast(ushort) dbCfg["port"].integer;
+		username = dbCfg["username"].str;
+		password = dbCfg["password"].str;
+		dbname = dbCfg["dbName"].str;
+
+		switch (dbCfg["connector"].str) {
+		case "postgresql":
+			connector = DBConnector.DB_PGSQL;
+			break;
+		default:
+			break;
+		}
+	}
+
+	Db = DB.getDB(dbSettings);
+	Db.connect();
+
+	return 0;
 }