[Tile-serving] [openstreetmap/osm2pgsql] Add trim(), split_unit() and split_string() Lua helper functions (#1318)

[Jochen Topf]

@joto pushed 2 commits.

2a826c3aaeecd902d85c21524b61149439c26549  Add trim(), split_unit() and split_string() Lua helper functions
ca7c5faed42cde06311aca19272419d5dd27264b  Make several Lua helper functions handle nil


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View it on GitHub:
https://github.com/openstreetmap/osm2pgsql/pull/1318/files/25201fd8a60d5fc8ce51a81d4e30f77710bf87b5..ca7c5faed42cde06311aca19272419d5dd27264b
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