ISR: Add the ability to disable subtitle animation even when using no buffering.
Cosmetics: Use a short alias instead of GetRenderersSettings().
Put the subpic queue settings in a structure for easier use.
ISR: Add the ability to choose at which state an animated subtitle will be rendered when the animation is turned off.
Sync renderer: Use TRACE to print debug message.
CPPageSubtitles: Various cosmetics.

Reduce the visibility of variables and functions, remove unused variables and functions, use better name.
ISR: Animated subtitles: Add the ability to control the animation rate.