[feature][module] Multiple response strings

[tmelliott]

There's an existing 'multiple response' module, but that requires data be in the form

varA	varB	varC
1	0	0
1	1	0
0	1	1

however often it's more like

var
A
A,B
B,C

The latest version of iNZightTools allows importing the latter, and splitting it into the former - however, the graphical/summary functionality is in iNZightPlots which we can't update in Lite (without a lot of work #287).

This is a request from a user, specifically in a situation where there are 100s of responses (ethnicity). I thought it might be easiest to create a dedicated module for analysing multiple response strings. Something like:

1. choose variable containing delimited values
2. specify delimiter
3. convert variable to a multiple response variable - perhaps the rimu package or similar can help?
4. then add in some basic graphics and summaries - perhaps with a multi-select box to choose which values to display? we can discuss further with the CaS team about their use-cases.

OR

Modifying the existing multiple response module (if the graphics/summaries available are adequate) and adding an extra option to split a string directly in the module - this is to prevent iNZightTools from adding 100s of binary variables to the dataset, which just makes working with the rest of the dataset pretty unfun.

[chrk623]

Maybe two tabs, binary and multiple? Each tab should also have column type checking, i.e., only show binary columns in the binary tab.