App & Core: More subdivisions

Add more subdivisions. For example, for 6-8 time, add a dotted quarter note.

Changed the title from "More subdivisions" to "App & Core: More subdivisions"

This would be very helpful, I hope it will be worked on eventually

Merged "Adicionar mais Subdivisões" #595

"Add subdivisions like 32nd notes, sextuplets, among many other subdivisions."

Merged "Clicks/beat" #662

"D I was trying to practice my paradiddle diddles, but i noticed the was no sixlet subdivision. Please add more subdivisions."

Merged "Metronome" #654

"Add half notes and dotted halves to available subdivisions. Many 3/4 songs time signatures are denoted by the time given to a dotted half."