Allow 2 Variant_Classification shown on Oncoplot

[wangzunq]

Describe the issue
Hi,

I would like to show 2 variant classification as 2 triangles(split tile) for same gene if that gene happens to have 2 types of variant classifications in sample sample. Currently as long as a gene in the same sample has more than 2 it just mark it as Multi_Hit. Thanks for any suggestions.