Rework the cache reset when resize the canvas

[dmitrylyzo]

Changes

• Extract the options.
• Compare the resolution of each frame with the current canvas size.
• Compare the subtitle display end time, not the gap end time. The gap is invisible, after all.
• Keep some frames within specified time regardless of the resolution. Equal to the 10s time limit in the old version.
• Discard distant frames if maximum time is specified. Equal to the 30s time limit in the old version, but currently disabled by default.
• Reduce the guaranteed (minimum) display time (was 10s - the low-res frames are displayed for too long, now 1s).
• Disable size limit by default.

Issues
In theory (more for increasing the size):
Resizing the canvas with, say, 15% step, the old version keeps ~30s (if the size limit allows) of low-res frames instead of discarding them.

[dmitrylyzo]

With continue the far good frames take up some size, leaving less room for the near frames and making a gap.
This can happen with smooth resizing, when the far frames are more recent and correspond to the current canvas size.
Using break forces to rerender the good frames.

UPD:
On the other hand, I don't like the fact that the set of newly rendered frames (perfect ones) will be interrupted by the saved "good" ones. So using break makes the set to be consistent in terms of quality.