Allow to query by sets on intersections matrix, improve visuals

[krassowski]

• Allow to query all points from a set on intersection matrix, closes how to give same color as each set and point  #115
• Improve visuals by moving highlights layer to the top, closes geom_segment has outline sometimes #113

[codecov-commenter]

Codecov Report

Merging #119 (d0f407a) into master (cc90ddd) will increase coverage by 0.07%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #119      +/-   ##
==========================================
+ Coverage   96.02%   96.09%   +0.07%     
==========================================
  Files           4        4              
  Lines        1534     1538       +4     
==========================================
+ Hits         1473     1478       +5     
+ Misses         61       60       -1     

Impacted Files	Coverage Δ
R/upset.R	97.56% <100.00%> (+0.17%)	⬆️

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