Feat: Flash playback using Ruffle

What does this MR do?

Fixes #694 (closed).
This merge request introduces Shockwave Flash playback support using the Ruffle emulator.

Thanks to all the people who helped make this possible:

Debugging:

• From the Ruffle team: kjarosh, Dinnerbone, nosamu
• From the Sharkey team & contributors: Julia, hazelnoot, dakkar, piuvas
• Others: Freeplay

JP translation/localization: Henma

Reviewing (so far): Julia, hazelnoot, dakkar

And of course, the Ruffle project and its contributors!

This MR is standing on the shoulders of giants

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