SQLite FTS included in PB libs - Upgrade to FTS Version 5?

[pamen]

PB already supports full text search version 4 with the SQLite lib.
FTS Version 5 is much more flexible and allows for even faster and more modern searches with additional expressions like NEAR, better nesting and so on.
I think upgrading module FTS4 to FTS5 in sqlite lib would be great and possibly not hard to do - use libs compiled with different options for FTS5.
I could do it for my own dev environments, but distributing FTS5 with the default PB setups could benefit more than myself.