Rewriting control charts

[JTPetter]

• Wrote a single function for all control charts (x-bar, r, s, i, mr)
• Replaced and removed the old control chart functions everywhere (.xBarChart, .rChart, .IMRchart)
• Removed options to specify x-axis ticks in subgroups and individual charts (this should be in plot editing, so I did not include it in the new control chart function).
• Added option to specify stages to variable charts subgroups.
• Replaced decimals function with global decimal option .numDecimals
• Subgroups with one value are now displayed as having 0 range or NA in the s/r-chart.
• Fix x-axis in subgroups sometimes displaying an NA, when pretty defines a last tick that goes beyond the provided axis labels.
• Fix x-axis in subgroups sometimes displaying labels twice or half values.
• Added labels to all plots that use stages, specifying the stage.
• Changed options to switch between xBar & R and IMR chart in Process Capability to radio button.
• Added error message when x-bar charts are selected and subgroup size is < 2 (only possible in wide format).
• Adjusted IMR chart in process capability, it should not be available in the wide format. Added X-bar & mR chart as alternative option.
• Implemented X-bar & mR chart, which is a moving range chart of the subgroup means.
• Fixes This analysis terminated unexpectedly jasp-issues#2290
• Fixes [Bug]: Cannot create control chart for column with empty cells jasp-issues#1788
• Fixes [Bug]: quality control indivudal control chart won't run jasp-issues#2394
• Rule tables display the labels now when specified.
• Allowed ordinal variables for measurements in variable charts for individuals.
• Added functionality for individual charts to handle missing values.
• Added error message for autocorrelation chart when there are missing values.
• Added handling of missing values in stages to variable charts for individuals.
• Implemented option to specify stages but calculate limits over whole dataset, as in xbar & r chart by operator in gauge r&R.
• Some naming improvements and capitalization alignment.
• If a subgroup or axis label variable is provided for any control chart, the x axis title now has its name, if nothing is provided it is now "Sample".
• Make control limits solid lines when Phase 2 chart is created.
• Changed control chart subplots to always be vertically aligned in reports, never next to each other.
• Add option to specify fixed subgroup size when unequal, not simply take the largest. Changed input field and set default to actual sizes.
• Added option to use unbiasing constant or not to calculate s-chart.
• Added new extensive and verified unit tests for variable charts subgroups and variable charts individuals.

[JTPetter]

@koenderks @vandenman I understand this is a lot, but if either of you has time to look at this before the next release would be great!!

[koenderks]

@JTPetter Any idea why the unit test on ubuntu fails while the others do not?

[shun2wang]

@JTPetter Could you also fix the i18n test? thanks:-) just add 1$ 2$ into placeholders of gettextf("Removed %i %s that were not assigned to any stage.<br>", nDroppedStageRows, removalType)

[JTPetter]

@shun2wang done, thanks!
@koenderks No clue, and no access to any ubuntu machine, so not sure how I should go about fixing this... Has been broken for a while though, nothing to do with this PR.

[koenderks]

@JTPetter Could you then add skip(“need to find out why this does not reproduce on Linux”) (or something like that) in the code for this test?

[JTPetter]

@koenderks Okay, done!