Adding standard floating damage

This functions at the lowest level and does not need to be implemented per source of damage. Any damage inflicted to a Destructable will display the damage text.

https://app.asana.com/0/19050287655194/21090038366112
Adding standard floating damage.

Handled in Destructable.cs so it does not need to be implemented per source of damage. It's auto-magical.

https://app.asana.com/0/19050287655194/21090038366112
Merge pull request #21 from Covalent-Games/feature/floating-damage

Adding standard floating damage