Lua unpause and invisible seek support

[SuuperW]

See issue #4591.

Invisible emulation also needed significant changes after Lua's client.seekframe was deprecated.
The goal of invisible emulation, as is currently used, is to enable rendering a future frame as if it were the current one. To this end, all rendering, throttling, and FPS calculations are disabled during invisible emulation. Since we need the actual current frame to not render but do want to use throttling and FPS calculations, setting invisible emulation only really activates it once it is time to emulate the next fame. Conversely, we want to render the final Lua-seeked frame but not throttle or do FPS calculations for it. InvisibleEmulation becomes InvisibleEmulateNextFrame, but I have not changed the name of the Lua function. EDIT: Changed the name back, since it needs to be more complicated than that name suggests.

[SuuperW]

Ready for merge.

[SuuperW]

Now with better TAStudio support.

This whole invisible emulation thing seems like a big convoluted hack, and just to avoid capturing dirty states in rewind history + savestates. Idk, maybe that's important for Sonic Advance but still it feels icky.