Spotlight shadow maps are now limited only by h/w limits (UBO size and
2d array maximum layers), which works out to about 146 shadows.
In practice we hardcode the limite to 64, but this can be changed at
compile time. A higher maximum increases memory usage.
There used to be a bitfield per renderable with a bit for each shadow
map indicating if the renderable was "visible" from this light. The
limit to 14 came from that bitfield. All shadow maps used to be culled
first, setting the bitfield appropriately.
Instead, we are now processing spotlight shadows one at a time,
performing culling as we go. For this reason we don't need a bit per
shadow map.
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