Gantt package spin off of qdap

[trinker]

• spin off qdap
• keep time and words units separate
• utilize duration functions in textshape package
• use geom_point as | (pipe) plus geom_bars to ensure very short bars still appear.
• Maybe take a dataframe with preset column args (beginning and end duration)
• possible keep code for ggplot as an attribute

[trinker]

possible have plot methods for ggplot and javascript forms