* clean up title model
* update title style
* organize issue SC method
* remove background colors from styled text in issues
* collection view bg white
* remove card inset and clean up snap superview code
* clean up label design
* thread is root and change base font size
* remove borders on comment cells
* adjust collapse design
* adjust comment line spacing and make non-root body smaller
* refactor detail view
* viewer header background color
* more buttons in reaction cell
* vertical spacers working
* design basically finished;
* scroll to bottom accounts for inset
* PR review background color white
* fixup PR review comments
* spacing on merge and review
* readme background white
* rename to just "spacer"
* horizontal spacing
* fix tests
* wip
* reply cell shows up in comments
* focus on reply model and scroll to reply
* api to create PR comment replies
* reply working
* clean and code reuse
* even more reuse
* organize
