add arrow symbols to fonts

accessible by putting ^1 to ^8 (think "arrow number 1", etc) in your text
for narrow-width arrows (good for "wide font" highway signs), or ^a to ^h
for double-width arrows (good for all of the normal narrow-font signs).

in order, arrows 1 and "a" point up, 2/b points up-and-right, 3/c points
right, and so on, turning clockwise

Any other ^x pair just renders directly (no escape char, sorry)

1 files changed, 0 insertions, 0 deletions

diff --git a/textures/hdf_8b.png b/textures/hdf_8b.png
new file mode 100644
index 0000000..35681f0
--- /dev/null
+++ b/textures/hdf_8b.png