PatR 59818fb6ab implement #986 - camera flash 'tweak' ...

Implement the suggested feature that a camera's flash actually update
hero's memory of the map as it traverses across the level.  Turned
out to be more work than anticipated despite having the code for a
thrown or kicked lit candle or lamp to build upon.

Among other things it needed to update the circle code to handle
previously unused radius 0 to operate on the center point only.  I've
never touched that before and hope this hasn't introduced any bugs.

Also removes several instances of vision code operating on column #0.
(At least one is still present.)

2020-05-09 13:07:35 -07:00

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