[Feature] Implement a volume slider

[stringdotjar]

We need to add a volume slider to the framework. In HaxeFlixel, there is a default volume slider that allows you to press either + to turn up the master volume, - to lower it, and 0 to mute it.

Requirements:

• Implement a volume slider with +, - and 0 as the default controls. These should be easily changeable.
• Allow the volume slider to be toggled off or disabled.
• It should be easily changeable and swappable in case a developer would ever like to swap out its design or implement a custom version.

[EJ-Edwards]

Assign me to the case I will do it

[stringdotjar]

Assign me to the case I will do it

i will in a bit, but please dont use ai this time. actually the time to learn how the framework functions. read the COMPILING.md file to learn how to set it up if you havent already

[EJ-Edwards]

Ok thank you

[stringdotjar]

okay youre assigned it now