Improve bucketable_list() and create parsons()

[codecov-io]

Codecov Report

Merging #19 into master will increase coverage by 8.54%. The diff coverage is 98.51%.

@@            Coverage Diff             @@
##           master      #19      +/-   ##
==========================================
+ Coverage   82.24%   90.78%   +8.54%     
==========================================
  Files           5        9       +4     
  Lines         107      228     +121     
==========================================
+ Hits           88      207     +119     
- Misses         19       21       +2

Impacted Files	Coverage Δ
R/sortable_js.R	77.77% <ø> (ø)
R/incrementor.R	40% <ø> (ø)	:arrow_up:
R/sortable_options.R	90.9% <ø> (ø)	:arrow_up:
R/sortable_list.R	78.37% <100%> (+3.37%)	:arrow_up:
R/css.R	100% <100%> (ø)
R/parsons.R	100% <100%> (ø)
R/learnr.R	92.68% <100%> (ø)	:arrow_up:
R/bucketable_list.R	100% <100%> (ø)
R/methods.R	66.66% <66.66%> (ø)
... and 3 more

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[andrie]

The new proposed format for calling a bucketable list is:

bucketable_list(
    header = "This is a bucketable list. You can drag items between the lists.",
    group_name = "bucketable",
    add_sortable_list(
      text = "Drag from here",
      labels = c("a", "bb", "ccc")
    ),
    add_sortable_list(
      text = "to here",
      labels = NULL
    )
  )

In the code for bucketable_list() it's then quite straight forward to parse the ... dots and modify appropriately.

This commit adds tests for

• sortable_list(),
• bucketable_list() and
• parsons()

[andrie]

Merged with 6d9c6d57e2a968cf8603f999df58fc67843f8709