Add poplar tree

Poplars exist in two kinds: small and large trees. Both use the same
nodes, except for the sapling. Poplar leaves may drop one or the
other sapling.

Poplar trees require a humid environment, and water nearby.
Provided there is water, an occasional poplar will grow under less humid
conditions.

1 files changed, 0 insertions, 0 deletions

diff --git a/textures/moretrees_poplar_small_sapling.png b/textures/moretrees_poplar_small_sapling.png
new file mode 100644
index 0000000..fb9bd03
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+++ b/textures/moretrees_poplar_small_sapling.png