Renamed a number of things related to shrubs/trees
- -> lfsr_shrub_t - -> lfsr_tree_t The idea here is to adopt "shrub" as an umbrella term for the shrub/sprout union, and "tree" as an umbrella term for the bptr/btree union. I think this is a bit better than calling shrub/sprout "inlined" which is a _very_ overloaded term in this codebase (inlined in the tree? the mdir? inlined in the C struct?).
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