Fix code scanning alert - Implicit narrowing conversion in compound assignment

[Madmegsox1]

Tracking issue for:

• https://github.com/Madmegsox1/PolyScape-Engine/security/code-scanning/1

Font.java is deprecated so it will need to be removed from Polyscape and instead use FontMac.java.

[Madmegsox1]

Usage chart for Font.java... Font renderer needs to be rewritten anyway and the rest should be easy going