RELEASED 2.0, NOW WITHOUT THE BUGS! PROBABLY

It adds a calculator.
Adds Command /calc

Usage:
/calc <Mathematical Expression>
Example:
/calc 5^(5+5)

Adds embedded mathematical expressions into a chat message.

Usage:
<Message> {5^(5+5)}

Example:
I'm {(17.25*2)*2} years old.

Output:
<Player Name>: I'm 69 years old.