render arrowhead labels

[gavin-ts]

Summary

Render connection arrowhead labels in svg

Details

• fixes render: Arrowhead labels #169
• adds arrowhead label test case from issue
• fixes e2ereport script to read tests now in the dagre and elk directories
• adds out/.gitignore so out directory exists on a fresh clone
• TODO measure arrowhead label text for more accurate placement render: measure arrowhead label text #183

before

after

report (with names updated to include test case/ prefix)

[alixander]

sick, thx for taking this

if you're not planning to do that TODO in this PR (and I don't think it's necessary to), can u make an issue for the TODO and link?

what's with the empty out/.gitignore?

[alixander]

i just noticed u didn't even mark this as ready for review yet lol, my b

[gavin-ts]

what's with the empty out/.gitignore?

added it so the out directory already exists when you clone

[alixander]

append changelog!