Switch to camelized names for event keys

BEST code can easily get messy with lots of quotation marks used for selectors, events, etc. It'd be fantastic to switch to camelized names for event keys as it will significantly reduce the amount of quotation marks needed in `behaviors` and `events` sections of code. Camel case is more consistent with idiomatic JavaScript as well.

The only places I see that absolutely need dasherized strings wrapped with quotation marks are selectors, and we cannot really do much about it. However the rest can be changed for better developer experience.