* Try a ReactionCategory abstract 'model'
* Use ReactionCategory
* Lookup category, pre-reaction
* Lookup category > constant
* Category can sometimes be nil?
* Try something friendlier for code reloading
* Refactor: extract point calculation out of Reaction
* Reaction Category can have color
* Rename reaction points service to follow convention
* method signature changed as well, calculate -> call
* Fix typo, leading comment, and rename data structures for clarity
