Organize notifications between renderer process and main process

[cassidoo]

Right now notifications are spread between the main and renderer processes.

They should be reoriented so that sound and sending control is all in main, and all copy and custom parts are sent from renderer.

[ApurvaBasule]

@cassidoo can i work on this issue?

[cassidoo]

@ApurvaBasule sure thing, go for it!
I admit I started it and didn't get far because of some other responsibilities coming up, so I'd love to see your approach and maybe some of my code can be merged with yours, hahaha.

[cassidoo]

@ApurvaBasule any progress?