Track names are displayed across entirety of arranger

[andyshand]

Something like this:

Arranger clips have names visible which makes scanning easy, but group tracks require you to look to the left side of the screen all the time to figure out what the content is.

Would just require grabbing the image portion of track name from latest screenshot and repeating it across the x axis.

Potential implementation:

• Share memory across main and render Electron process
• Pass screenshot data as Napi::Buffer to renderer process (ensuring kept alive as long as not GC'd)
• Pass the track location data to renderer process, and use it to map each image to its track

Any improvements on the idea welcome.