customized_upset_plots_v3

Major updates from v2:

1. Intersect calculation now based on ComplexHeatmap, vastly simplifies the workflow.
2. Sets and subsets now ordered by sizes.
3. Default aesthetics are updated.
4. Composite plots now provided by patchwork instead of cowplot.
5. Extensions of upset plot now include set metadata and heatmap, in addition to box plot.