message: also add "-8k" screen size alias
diff: @@ -103,6 +103,8 @@ general app-parameters:
  alias for window size = 1920x1080
  -4k
  alias for window size = 3840x2160
  + -8k
  + alias for window size = 7680x4320
  -vp [float] [float] [float]
  camera position xyz
  -vu [float] [float] [float]
  @@ -316,6 +318,9 @@ usage --> "--generate:type[:parameter1=value,parameter2=value,...]"
  } else if (arg == "-4k") {
  width = 3840;
  height = 2160;
  + } else if (arg == "-8k") {
  + width = 7680;
  + height = 4320;
  } else if (arg == "-vp") {
  vec3f posVec;
  posVec.x = atof(av[i + 1]);
  