Implement Working triggers for Database

[DylanZeller]

Need to research how this is done with sqlite, or we can do some handler in the Database wrapper class.

[DylanZeller]

First Trigger could be When a Billable Items row is added to the database, we need to update the totalAmt on the Invoice linked to the billable items.

[DylanZeller]

2) When a payment is made to an invoice, then send an email to the business representative with the payment amount made and the new balance that is owed to the consulting firm.

[DylanZeller]

Not doing email, but balance update when payment is made complete.