Refactor handling of valid account names
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Move our system_names and system_groups out to a util header.
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Qt UI: Validate that the user's chosen account name is not contained in either system_names nor system_groups.
Closes: #388 (closed) Acked-by: @Sheila
The UI will look like this (except more KWin and less Aqua):
Edited by Anna Wilcox