Violin plots, quasirandom points positions, ggpairs options and more

• Added Violin plots
• Added options and fixes for histograms, barplots and densities
• Added options for Median/Mean/N labels (N digits, justification, edge positions.)
• Added points position_quasirandom and position_beeswarm
• Added multiple enhancements for theme control like panel.border, plot.tag.position and X and Y Axes Titles formatting
• Added multiple enhancements and options for ggpairs
• logticks and rug marks can now be on the outside of plot panel
• coordinates cartesian clip can now be set to off
• x/y axis percent and comma labels format now works for univariate plots
• x/y zoom now works when more than one x and/or y variables are selected
• long x/y discrete axes labels can now be wrapped to specified length
• UI updates and auto hiding for univariate plots, pairs, km
• Boxplots UI rework
• Readme updated
• summary level data vignette updated