less sketchy drawings
Merge pull request #187 from coh2/less_sketchy_drawings

less sketchy drawings, "done right"
Use lualatex

This enables better microtype.
Enable microtype

Closes #60.
Remove confusing "in the author's opinion" wording

Closes #188.
Remove changelog since we're not updating it anyway
Move CC logo into Illustrations folder
Whitespace fixes
Fix programmable inverter illustration
Use illustration macro
Make programmable inverter & XOR illustrations significantly smaller
Use the illustration macro more
Use the illustration macro some more
Minor text tweak
RC4 text tweaks
Improve illustrations for synchronous stream ciphers