[#747][#748] prevent from overriding these values if defined by the user
[#747][#748] prevent from overriding these values if defined by the user

rlugojr/melonJS,rlugojr/melonJS,melonjs/melonJS,srbala/melonJS,rlugojr/melonJS,melonjs/melonJS,srbala/melonJS,srbala/melonJS