Use an sqlite3 database for timer feature

There were some other small edits as well, mostly formatting or better
logging in certain functions

server/createDatabaseTables.js

@@ -0,0 +1,26 @@
+const sqlite3 = require('sqlite3').verbose();
+
+module.exports = async function () {
+    const db = new sqlite3.Database('data/database.db');
+    return new Promise ((resolve, reject)=>{
+        db.run(
+            `CREATE TABLE IF NOT EXISTS timers (
+                        ID INTEGER PRIMARY KEY AUTOINCREMENT, 
+                        user TEXT, 
+                        reminderTime INTEGER, 
+                        channel TEXT, 
+                        customMessage TEXT, 
+                        hasPassed INTEGER)`,
+            (err) => {
+                if (err) {
+                    console.error(`Error while creating table 'timers': ${err}`);
+                    reject(err);
+                } else {
+                    console.log("Table 'timers' created successfully.");
+                    resolve();
+                }
+                db.close();
+            }
+        );
+    })
+}