BREAKING CHANGE: Delta Pager + Large Refactor (#43)

BREAKING CHANGE: This MR addresses an underlying issue with the original implementation in regards to detecting line numbers for comments. 

As such, this is a major breaking change. The setup function signature has changed, please review the `README.md` for the new arguments. The delta pager has also been added as a dependency: https://github.com/dandavison/delta

There will be future work to implement a native solution for parsing changes and line numbers.

todo.md

@@ -1,13 +1,5 @@
 ## Todo
 
-- [x] Install for non-Lazy users
-- [x] Fix comments on non-changed file lines
-- [x] Delete, Edit Comments
+- [ ] Fix the u.merge function to avoid overwriting settings
+- [ ] Finish the Reply functionality
 - [ ] Auto-Pick buffer when Cycling Through Comments
-- [x] Clean up Camel Case to Snake Case
-- [x] Common Popup State
-- [x] Silence make command on build (don't rebuild every time)
-- [x] Fix gitlab.nvim vs. gitlab namespacing issue
-- [x] Allow customization of keybindings
-- [ ] Add logging functionality for all API calls
-- [ ] Delete should refresh the tree