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This allows cool things to be accomplished through chaining BlockReaders
together without having to handle the block plumbing yourself.
The current set of implementations are a simple one that reads blocks
from a scanner delimited by a pattern, one that has a queue of blocks it
will attempt to pull from before reading, and one that triggers an
action before a block is read.
As an example use, for FDS, a combo of simple -> triggered -> pushback
is used where the triggered is used for prompting the user, and the
pushback supports macros.
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