Enhancement: Support Different Time Signatures

[EliteMasterEric]

I don't know much about music composition, but from what I understand, the fact that every section in an FNF song chart is exactly four beats/16 steps long means that certain types of songs don't quite work properly in terms of camera panning.

The proposal in #65 may make this possible. It makes the note data not tied to sections at all; instead, the thing that controls the camera is a set of song events, which are customizable.

I believe part of implementing #65 while still making the chart usable involves allowing for the automation of a setting the camera every four beats. A change here would involve a visual indication of where and when "sections" of the music chart end and changing where these automated camera switches happen.

Please correct me if I'm wrong here.