Stacks a list of Move objects
## S4 method for signature 'list' moveStack(x)
a list of Move objects
This function stacks single Move objects to a MoveStack object.
All animal names are converted into 'good names' which means, that spaces are replaced with points and duplicated names get an individual number added. For example:
'Leroy, Leroy' -> adding number to duplicated names ->'Leroy, Leroy.1'
'Ricky T' -> replacing spaces -> 'Ricky.T'
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