Introduce symtab_datum_t

This patch set adds a new structure - symtab_datum_t - and converts all of the datum types to place this struct as their first member. This unifies the storage of data common to all symtab datums and allows free casting between specific datum types (e.g., role_datum_t) and symtab_datum_t. A minor cleanup using this new struct is also included.

A later patch set will build on this to also store scope information in the symtab_datum_t.

This patch set likely conflicts with all of the other ones floating around - if it is easier to apply those first I can easily rebase this one once those go in.

Karl

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