section-select: Implement a prefix-tree

section-select: Implement a prefix-tree

Now that we have a list of potentially matching sections per wild
statement we can actually pre-fill that one by going once over all input
sections and match their names against a prefix-tree that points to the
potentially matching wild statements.

So instead of looking at all sections names for each glob for each wild
statement we now look at the sections only once and then only check
against those globs that have a possibility of a match at all (usually
only one or two).

This pushes the whole section selection off the profiles.