Improve frame-rate stability

Some frames would sporadically lag between on_process and on_render,
because on_process would bail once one frame had elapsed since the end
of the previous on_process, and the processor would not always reach a
sleep point in this time. This was really an issue to do with with the
time taken between the end of the previous on_process and the start of
the current on_process.

To fix this, the on_process invocation will run the processor for a full
frame, without subtracting the time elapsed between frames. This seems
to have no negative effects. It also allows us to remove end_of_process
from the emulator.

The sleep in the Signal::Sleep handler has also been removed, because
it serves no real purpose and will most likely cause issues in the
future.

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