Vensim name generation fails for arrays with > 2 dimensions

[ToddFincannon]

SDEverywhere supports arrays with an unlimited number of dimensions, except for a problem when generating Vensim names in the output text file header row. For instance, generating C code for the 4D constant array:

ndim4[DimA, DimB, DimC, DimD] = 4

throws this exception:

TypeError: Cannot read property 'replace' of undefined
at decanonicalize (file:///Users/toddfincannon/Projects/SDEverywhere/src/Helpers.js:52:17)
at Object.vensimName (file:///Users/toddfincannon/Projects/SDEverywhere/src/Model.js:662:32)
at headerTitle (file:///Users/toddfincannon/Projects/SDEverywhere/src/CodeGen.js:344:18)

[ToddFincannon]

The vensimName function was limited to 2 subscripts. I used the new matchAll JS String function to extract subscript names with any number of dimensions. I added a 4D array variable to the arrays_cname and arrays_varname test models. I also brought arrays_varname up to date with the arrays_cname model.