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Its name suggests it's about line of effect, while in fact it's both effect
and sight. Thus, I've split its uses into LOS_SOLID and LOS_SOLID_SEE -- the
former is what LOS_SOLID was usually understood to mean, the latter is what it
actually was (being targettable with an arrow/beam).
The difference is: LOS_SOLID_SEE obeys clouds.
The name of the latter is abysmal -- if you have a better idea, please sed.
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There were two functions: one used no cache and ignored clouds, another one
has a cache and accepts different LOS models.
I added a new cached model: LOS_SOLID (using opc_solid). All but one uses
of opc_fullyopaque (two-argument cell_see_cell()) were bugs to me, so they
were moved to a different model.
This makes Refrigeration not work through glass walls anymore (it still
works though clouds).
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There are two speed-ups:
* no need to check rays in the bounding square beyond a circle
* don't calculate both LOS_DEFAULT and LOS_NO_TRANS every time
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