shouldn't play button always display every frame?

[zozorg]

Synfig version & platform:
linux 1.3.5

Issue description:
I guess it is more of an opinion.
When an animation is too complex to achieve real-time rendering, the "play" button could behave in two ways:

• Give up on real time and still display every frame.
• Only display one in every X frames to achieve real-time ( what synfig does ). But this makes play button pretty much useless for complex animations. If you want real time, you have "preview".

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