DB Operations: MySQL database queries wrapper

This class is a wrapper around MySQL databases to execute most type of database SQL queries. It can:

- Connect to MySQL server and select database to work with
- Delete records from a table using and without using the where clause
- Update records of a table
- Drop a table from a database
- Create a table
- Insert values into a table
- Show all tables in a database
- Show all databases
- Fetch and display all records from a table
- Close database connection