[FEATURE] Add an option to DROP table if exists

[danielschweiger]

Aadd a "not selected" checkbox to select if the tables should be dropped before create would be nice.

[antonioprudenzano]

It would be nice to add a if exists clause too

[Happy4Game]

I started to work on this, I think we can use 'IF NOT EXISTS' clause only on PostgreSQL and MySQL PS: SQLite too but it's already available