Reduced imports of tidyverse.

[dewittpe]

After years of working in the tidyverse I have come to the conclusion that maintaining packages dependent on the ever changing API of the tidyverse is no longer worth the time and effort. There are a lot of good things about the tidyverse and I will almost certainly be using parts of the tidyverse for years to come. The focus on improving qwraps2 is on reducing the dependency of tibbles and rlang. This issue will be used to track the functions and patches aimed at reducing the use of tibbles.

goals:

• get the functions in qwraps2 which do not need tibbles to work on base R.
• extend methods which need tibbles to be in S3 classes for tibbles. (likewise for extending to data.table)

Related issues: #71, #91, #97

98 is similar, omit the use of pipes from the code base, but not really part of the tidyverse.

[dewittpe]

This work is done. There are still some elements of the tidyverse, ggplot2 is there. Also some S3 methods for tibbles (summary_table). Overall, the dependency on dplyr, rlang, ... is gone.