Add coverage track rendering
Turn selectedExons into a set, allow multi-select

Paint exons as empty with a border when selected. Have gene track expanded by default, since the user needs to select each exon from each isoform
Make Amino acids a bit transparent, so one can still see what's selected

Looks a bit funny because the exons are still drawn behind the amino acids, but it's not terrible.
Add dragging limits to Sashimi plot window based on original view
Have the zoom slider panel dispatch events to reference frame using Guava EventBus
Set zoom limits in SashimiPlot (can't zoom out too far)
Draw text above/below arcs, instead of at midline
Draw above/below alternating, make sure the above/below stays consistent with pan zoom.

Set Snp threshold so coveragetrack doesn't get colored in sashimi plot
Treat all exons as just loci, highlight them similarly. Still only works in expanded mode
Relocate and rescale coverage track to be centered, autoscaled, only half the height of sashimi track
Have arcs get drawn from top of coverage graph
Load splice junctions if not already present.

Need to have mechanism for repainting when data is reloaded, right now it's just blank until the user triggers a repaint
Clear background around numbers so they can be clearly read over the arcs

Remove ellipse and circle options from UI
Add genomic axis
Add drawing of track name
Change arc colors to all be ARC_COLOR_POS
Set stroke thickness to be proportional to log of depth
Don't render features in SelectableFeatureRenderer without exons
Major refactor so we have a TrackSelectionDialog, which can be used for single or multi-select of tracks
Adjust SashimiPlot so it handles multiple AlignmentTracks as input