Allow "subroutine" calls where events can invoke other events.

For use with The Winning Plan to play the chosen event immediately.

Split vm_draw_6_play_1_place_any_on_top_of_draw into two instructions.

First instruction draws the 6 and prompts to play an event.

Calling the new event stashes the existing VM state, calls the new event code.
When the new event returns with vm_return, we find the stashed state, restore
it, and vm_next to execute the second instruction.

The second instruction does the place on top/bottom of deck part.

reworked event subroutine calls

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